The 1911-2011 Bridge

Welcome #

This wiki is the single source of truth for the bridge design: the architecture argument first, then dimensioned drawings, then the two bills of materials, then the law enforcement program and the investor framing. It is a study document, not a sales brochure. Where a number is not yet proven, the document says so, and where v1.0 got a number wrong, Chapter 13 says that too.

Dimension labels

Every measurement in this wiki carries one of four tags:

• TGT Design target. Our number. Set by us, open to revision as prototyping proves or breaks it.
• SRC Sourced. Pulled from a cited reference (see Chapter 15), usually published gunsmithing practice or manufacturer data.
• STD Standard. From an industry or military specification (for example MIL-STD-1913 rail geometry, or SAAMI cartridge dimensions).
• PHY Derived. Follows from first-principles physics, with the calculation shown in the text where it is claimed. New in v2.0.

Bridge thesis #

Three pistols define the design space. The M1911 gives us the operating system: short recoil, a tilting barrel on a swinging link, and vertical locking lugs that gunsmiths have been fitting to match-grade accuracy for over a century. The Browning Hi-Power gives us the capacity ethos: Browning's own follow-on doubled the magazine with a staggered column and proved a service pistol could carry 13 rounds. The 2011 platform (STI, now Staccato) gives us the packaging: a modular frame that bolts a double-stack polymer grip module to a 1911-pattern upper, so the architecture finally scales past 8 rounds.

The bridge takes all three deliberately. We keep the 1911's link and lugs rather than the Hi-Power's linkless cam, because the link system is the most understood, most tuneable, most smith-supported lockwork in the pistol world. We take the 2011's two-piece frame because it is the only honest way to get double-stack capacity under 1911 lockwork. And we aim the package at the gap the market left open: current hybrid 2011s are duty-sized and duty-heavy. Nobody sells a skeletonized, optic-ready, railed 2011 that honestly competes on carry weight. That is the product.

The buyer that makes it a business is not only the carry customer. Staccato proved the 2011 pattern sells to law enforcement at duty-contract margins, and Chapter 11 aims the same pistol, in its Series 80 duty configuration, at that market, Texas sheriff's offices first. The consumer line is real and it funds the pipeline. The agency contracts are the margin engine.

Link architecture #

The swinging link is the heart of the 1911, and it is deliberately simple: a small two-hole strut, pinned to the barrel at the top and riding the slide stop pin at the bottom. Its only job is to pull the barrel down out of lockup at the right moment. Gus Norcross states the rule every 1911 smith works by: the sole function of the link is to unlock the barrel; it should never be used to increase lockup. Lockup belongs to the lugs (Chapter 3). Timing belongs to the link.

Links are selected by center-to-center distance. The published working range runs .268 in (Wilson #1) to .288 in (Wilson #5), with .278 in (Wilson #3) the standard SRC. Our design standardizes on the .278 nominal with .268 and .273 available as fitting stock TGT, because a tighter slide-to-frame fit wants a slightly shorter link. The link pin runs .154 to .156 in as a snug press fit in the barrel SRC. Correct fit is verified by feel: with the slide stop held hard up and to the rear in lockup, the link must still wiggle slightly fore and aft. No wiggle means it is binding and carrying load it was never meant to carry.

Why not the Hi-Power's linkless cam

The Hi-Power replaced the link with a cam slot in the barrel underlug riding a fixed crossbar. It works, and it simplifies the barrel, but it gives up the 1911's tuning leverage: a 1911 smith can change timing and feel with a two-dollar link and a pin gauge set, and the entire aftermarket speaks that language. The bridge keeps the link because our service story depends on it. Every dimension on this sheet is a number any competent pistolsmith already owns tools for.

Locking lugs #

Barrel fit is the single most important factor in 1911 accuracy, and the lugs are where that fit lives. In battery the barrel is wedged between the slide stop pin below and the locking grooves in the slide roof above, with zero perceptible movement SRC. The upper lugs take the vertical thrust of firing; the bottom lugs control the lockup geometry against the slide stop pin. Get both bearing fully and evenly and the pistol shoots to its barrel. Get them wrong and no optic or trigger job will save it.

The fitting numbers are published shop practice, and we adopt them as our manufacturing targets. Slide stop pins run Ø.200 in nominal in a Ø.202 in frame hole, with oversize pins to Ø.203 in for worn frames SRC. Bottom lugs are cut (dedicated fixture, .195 or .186 cutters, or a 5 mm end mill closest to the .200 pin) until the barrel locks up on a .196 to .197 in pin gauge SRC. Contact is verified with a blackened gauge pin: both lugs must mark the pin evenly. One lug doing all the work is a reject, not a quirk.

Fit rules carried into production

• Zero-movement lockup as a shipping standard TGT: hand-cycled without the recoil spring, lockup shows slight resistance and zero rock.
• Even two-lug contact SRC: gauge-pin witness marks on every barrel, documented per serial.
• Oversize path SRC: slide stop pins stocked .200 through .203 so lockup can be restored at service intervals without replacing the barrel.
• Bottom-lug return path SRC: on the forward stroke the bottom lugs ride the slide stop back up into battery, which is why lug contour and pin condition are wear items on the inspection schedule (Chapter 4).

Recoil cycle & unlock timing #

The bridge is a short recoil, locked-breech pistol. On firing, slide and barrel recoil together for a short distance while the chamber is still sealed and pressure is doing its work downrange. Then the link, anchored at the slide stop pin, rotates the barrel's rear end down out of the slide's locking grooves. The barrel stops; the slide runs on alone, extracting and ejecting, compressing the recoil spring, and cocking the hammer. The spring then drives the slide forward: it strips a round from the magazine, chambers it, and the bottom lugs ride up the slide stop to cam the barrel back into lockup.

Timing is set by three numbers. Unlock begins at about .100 in of slide travel TGT and completes by about .250 in TGT, both governed by link length (Chapter 2) and bottom-lug geometry (Chapter 3). Total slide travel for the 4.25 in gun is 1.75 in TGT. The safety logic is inherent to the geometry: the lugs do not clear their recesses until the bullet has left the muzzle and pressure has fallen. v2.0 proves that claim instead of asserting it.

The unlock margin, from first principles

The claim that matters is that the lugs stay engaged until the bullet is gone. It follows from conservation of momentum, and the arithmetic is short enough to show in full. While the lugs are engaged, slide and barrel recoil as one mass, and the rearward momentum of that mass mirrors the forward momentum of the bullet at every instant. Integrating that balance over time gives a position rule: slide travel equals bullet travel scaled by the mass ratio, x_slide = (m_bullet / M_recoil) · x_bullet PHY.

Put in the numbers. A 124 grain bullet against 15.7 oz (6,870 grains) of recoiling metal (slide 10.2, barrel 5.0, plus about 0.5 oz of the Chapter 7 recoil system, the share that effectively moves with the slide) is a mass ratio of about 1 to 55. The bullet's run from seated base to muzzle in a 4.25 in barrel is about 3.7 in. So the slide has moved about .07 in when the bullet exits. The heaviest common service bullet, 147 grains, pushes that toward .08 in, and powder gas adds a few percent before exit. Call the band .07 to .09 in PHY. Unlock begins at .100 TGT. The margin is thin, roughly ten thousandths in the worst case, but it is real, and it has a property worth stating plainly: the ratio is set by masses, not velocity, so a hotter load does not move bullet-exit travel. Only a heavier bullet or a lighter gun does.

That last clause is a design constraint, not trivia. Chapter 7 removes slide mass on purpose, and this calculation is what bounds it: the recoiling mass stays at or above about 14.5 oz PHY, or bullet-exit travel chases the unlock point and the margin goes. The skeletonization budget is written against this floor. By the same momentum arithmetic the slide arrives at unlock carrying roughly 24 feet per second, which is the number the recoil spring and the frame abutment live with.

The back half of the stroke

v2.0 also re-timed the extraction and ejection events, because v1.0's numbers failed a physics check. A 9mm Luger case is .754 in long (SAAMI STD), and the case rides the breech face during recoil, so its mouth cannot clear the chamber before .76 in of slide travel PHY. The v1.0 claim of ejection at .55 to .75 in was therefore impossible; the case would still have been in the chamber. Corrected: extraction completes no earlier than .76 in, and ejection, when the case base strikes the fixed ejector and pivots out the port, is targeted at 1.10 to 1.40 in TGT, to be measured on the prototype with a high-speed camera.

Spring and wear notes

• Recoil spring: flat-wire, commander length, 12 to 14 lb for 9mm TGT. Final rate is set on the range with the actual slide mass after skeletonization (Chapter 7), not before it. The spring's job at the back of the stroke is to manage roughly 24 feet per second of slide velocity PHY.
• Link-down clearance SRC: the slide stop must follow the bottom-lug contour from locked to unlocked without binding. Inspected at build and at every 5,000-round service TGT.
• Wear items on the inspection schedule TGT: link, link pin, slide stop pin, bottom-lug contour, recoil spring. All are small, cheap, and user or smith replaceable, which is the service argument for keeping the link system, and the armorer-program argument in Chapter 11.

Sear & hammer shelf engagement #

Fire control is single action, the 1911 way: a hammer with a full-cock shelf, a sear whose nose rests on that shelf, and a disconnector that forces the trigger to reset between shots. The market has come back around to valuing this honestly. Staccato built its name on 2011 triggers that behave like good 1911 triggers, and the industry followed. The bridge treats sear-on-shelf geometry as a first-class design surface, not an afterthought to be tuned around.

The load-bearing number is shelf engagement depth: .018 to .022 in, .020 nominal TGT. Deeper is safer and heavier; shallower is crisper and less forgiving of wear and dirt. We take the middle of classic match practice and hold it with inspected sear and hammer sets rather than stone-and-pray fitting. Trigger pull splits by market: 3.5 to 4.0 lb TGT for the consumer build, 4.0 to 4.5 lb TGT for the duty configuration (Chapter 11), both with a clean break and short reset from the same engagement geometry. The half-cock notch remains as a passive arrest, exactly as Browning drew it.

Feature pack #

Every feature on this list is locked, and every one earns its place against the carry thesis, the duty thesis, or both. Nothing decorative ships.

• RMR-ready optic cut with irons. Slide milled for the Trijicon RMR footprint, with suppressor-height iron sights for a lower-third co-witness TGT. The rear sight sits in its own dovetail aft of the pocket so the pistol is never optic-dependent. Pocket machining is verified against the current Trijicon footprint drawing before first article, not assumed. Open decision, flagged and unresolved: the duty market is drifting toward closed-emitter optics (Aimpoint ACRO pattern); whether that becomes a second slide variant or an adapter plate is decided with the first agency pilot, not guessed here.
• Deep serrations, forward and aft. Pitch .100 in, depth .035 in TGT. Front serrations are standard equipment because press checks happen; aft serrations do the daily work.
• Picatinny dust cover. Hard requirement. MIL-STD-1913 rail, three slots minimum, dimensioned in Chapter 7. This is a duty-market gate: agency weapon lights (Streamlight TLR-1 HL, SureFire X300 class) mount here, and Chapter 11 treats light fit as a contract requirement.
• Lanyard-style mainspring housing. Flat, checkered, with the classic 1911A1 loop. Retention heritage for a gun meant to be carried in the open and the woods, and a feature marine and corrections units still specify.
• No safety plunger on the Series 70 path. The firing-pin block parts exist only in the Series 80 BOM (Chapter 10). The 70 gun's drop safety comes from a titanium firing pin and extra-power spring.
• Finish system. Cerakote Elite over hardcoat-anodized aluminum and treated steel, NDLC on the wear smalls. Full treatment, including the anodize base layer the v1.0 spec omitted, in Chapter 8.

Skeletonization & weight targets #

The market gap is weight, and v2.0 states it honestly. Hybrid 2011s are excellent pistols that carry like boat anchors: full steel guns run well past 33 oz before a loaded magazine. The bridge is engineered backward from an audited mass budget: 26.6 oz bare and 31.2 oz with a 17-round steel duty magazine TGT. That is lighter than every steel duty 2011 while keeping the full rail and capacity. The v1.0 headline of 28.0 oz with magazine did not survive the audit; it leaned on a 2.9 oz magazine that the one live listed figure contradicts and a 3.6 oz bull barrel that no plausible steel volume supports (Chapter 13, item 3). The stretch table below prices the lightest honest build, and it lands just over 28. The mass comes out of non-load-bearing material only. Lockup surfaces, rail structure, and the hood are never touched.

Mass budget, audited TGT

The stretch table: buying back ounces

The paths below are not free, and two of them answer to physics. The Chapter 4 unlock margin sets a floor on recoiling mass (slide plus barrel plus guide rod) of about 14.5 oz PHY. The current budget carries 15.7, so the slide and barrel paths together (1.0 oz) clear the floor with only 0.2 oz to spare. The table is still a menu with consequences, not a checklist. The floor is also a manufacturing-traveler rule: any slide or barrel revision that drops projected recoiling mass below 14.5 oz is rejected at CAD review unless unlock timing is re-derived with it.

Best honest stretch: 31.2 minus all four paths lands at 28.1 oz with magazine TGT. Sub-28 is not on this sheet unless the magazine tube beats its 2.9 oz target, and duty guns carry steel tubes regardless (Chapter 11). The number is gated on the magazine, which is exactly where the risk belongs to be stated.

Where that lands

Comparisons from live manufacturer spec pages, checked 2026-07-20 SRC: a Glock 19 is 21.16 oz bare and 23.63 oz with an empty magazine. Staccato's aluminum-frame C2 is listed at 25 oz without optic or magazine, and the steel-frame Staccato P is listed at 33 oz. Compared on the same no-magazine basis, the bridge at 26.6 oz bare undercuts the steel duty 2011s by roughly 6 oz with the same rail and capacity, and carries 31.2 oz with its steel magazine aboard; the 28.1 oz stretch build closes toward the compacts while keeping the 4.25 in barrel and the rail. That seat, light for a duty gun and serious for a carry gun, is the whole business case.

Finishes: hardcoat, NDLC, Cerakote Elite #

Three layers, three jobs, one more than v1.0 specified. MIL-A-8625 Type III hardcoat anodize is the structural base on the 7075 upper: aluminum that rubs steel does not survive on paint. Cerakote Elite is the environmental skin: a ceramic thin film, about .001 in thick, carrying the corrosion and abrasion burden on the slide and frame exteriors. NDLC (a diamond-like carbon coating; we use the NDLC label for our spec) is the wear treatment: a hard, low-friction carbon layer on the parts that rub for a living. Vendor-published hardness for DLC-family coatings runs well above hard chrome; treat the exact figures as directional until our coupon testing confirms them.

Fit rules under coating

• Film thickness is a tolerance input. A .001 in coating is real material on fits that live in single-thousandths, and hardcoat grows the part too (roughly half the film builds outward). Coating and anodize thickness are budgeted into the lug, pin, and rail dimensions from Chapters 2, 3, and 7, not discovered at assembly.
• Lockup bearing faces are masked or post-fit. Lug bearing surfaces, the sear shelf, and the hammer hooks are either masked during coating or final-fit after it. Cosmetic coverage never outranks Chapter 3's zero-movement rule.
• Coupon testing before production claims. Salt-fog and abrasion numbers stay out of investor and agency materials until measured on our own coated coupons. Directional vendor data is labeled as such.

BOM: Series 70 (no firing-pin block) #

The 70 path is the purist build: no safety plunger, no frame levers, nothing between the trigger and the cleanest break this architecture can give. Drop safety is managed the way the industry manages it on 70-pattern guns: a lightweight titanium firing pin plus an extra-power firing-pin spring, so inertia alone cannot carry the pin to the primer. That is a mitigation, not a mechanical block. The 80 path (Chapter 10) exists for buyers and markets that require the block, which includes every duty sale in Chapter 11.

BOM: Series 80 (firing-pin block) #

The 80 path adds a true drop-safe system: a spring-loaded plunger in the slide blocks the firing pin until the trigger's rearward travel lifts two frame levers and clears it. The cost is four added parts, a plunger bore in the slide, and a small change in trigger takeup that good shops tune out. The return is market access. Most agencies treat a firing-pin block as table stakes in policy, and consumer roster states require it by statute. Texas has no handgun roster; the Texas agency case for the 80 is policy and liability, not state law (Chapter 11). Everything else on the gun is identical to Chapter 9, including the Chapter 5 engagement geometry.

Delta summary

• Parts delta: +4 (plunger, plunger spring, two levers), plus the slide variant's plunger bore.
• Mass delta: about +0.3 oz TGT for the block parts and the steel firing pin, putting the duty configuration near 26.9 oz bare and 31.5 oz with magazine against the Chapter 7 budget.
• Trigger delta: measurable takeup change, same break geometry (Ch 5). Consumer tune 3.5 to 4.0 lb; duty configuration 4.0 to 4.5 lb (Ch 11).
• Compliance delta: mechanical firing-pin block supports agency policy requirements and consumer roster states. Final claims follow actual drop-test certification, not intentions.
• Duty configuration: the Chapter 11 agency package is this SKU, duty trigger tune, steel magazines, and the co-witness optic setup from Chapter 6.

Law enforcement & government program #

This chapter is the plan for the revenue that matters: law enforcement and government contracts, with Texas sheriff's offices as the beachhead. The consumer thesis in Chapter 7 is true and it funds the pipeline. Agency contracts are the margin engine, and the route is already proven: Staccato (formerly STI International) turned the 2011 from a competition gun into a duty gun by building a law enforcement program around the pistol, not just a pistol. Their published materials claim approval for duty use by roughly 1,400 agencies, and the platform's adoption by the United States Marshals Service Special Operations Group made the category credible. Their numbers are theirs; verify before quoting them in a lender document. The lesson stands either way: agencies buy programs, not pistols.

What an agency actually buys

• The duty pistol: Series 80 SKU in the duty configuration, 4.0 to 4.5 lb trigger TGT, steel 17-round magazines, suppressor-height co-witness irons.
• A duty holster that exists. Level II or III retention from a major vendor (Safariland fit or equivalent) is a purchase prerequisite, not an accessory. No duty holster, no duty contract. This is why Chapter 6 froze the slide at the 1911-standard .920 width and why the rail geometry is MIL-STD-1913 to the letter: holster and light fitment are dimensioned interfaces, and we changed the design where v1.0 broke them. Slide width and rail geometry are interface-control surfaces, a light-and-holster API, frozen on the BOM like lockup dimensions.
• A weapon light that mounts. Agency-standard lights (Streamlight TLR-1 HL, SureFire X300 class) on the Chapter 7 rail. Light fit is part of first-article verification.
• An optic policy. RMR-footprint red dots today; the closed-emitter question from Chapter 6 gets answered by the first agency pilot's requirements.
• Support: armorer course, spare-parts kits built from the Chapter 4 wear-item list, and the per-serial fit records from Chapter 3, packaged as a serial dossier that ships with each pistol. The link-and-lug service story is a genuine differentiator here: every wear item is cheap, documented, and replaceable at the agency armorer's bench.
• Magazines that pass. The 2011 platform's historical weak point is the magazine. Every shipped tube passes a live-fire acceptance test, and the polymer-tube stretch path from Chapter 7 stays out of duty sales until it survives this protocol.

Acceptance and certification gates

• Reliability acceptance: 2,000 mean rounds between stoppages TGT demonstrated over a documented 5,000-round test and evaluation protocol per submitted pistol, with the log delivered to the agency.
• Drop certification: Series 80 mechanism certified by real drop testing before any drop-safety claim appears in a submission. Chapter 10's rule, restated as a contract gate.
• Duty-gear fitment: holster retention and light mounting verified on first articles, in writing, per model of holster and light.

How Texas agencies buy

Sheriff's offices are county agencies. Purchases route through the commissioners court, and Texas Local Government Code Chapter 262 requires competitive procurement above the statutory threshold, with a practical exemption for purchases made through interlocal cooperative contracts. The working vehicles are the cooperatives: BuyBoard, TIPS, and HGACBuy. State agencies buy through TXMAS and Texas SmartBuy. Federal doors are the GSA Multiple Award Schedule and the 1122 Program, which lets state and local agencies buy through federal channels for counter-drug missions. Getting on one or two cooperative contracts is the difference between a demo gun and a purchase order. Verify current thresholds and vehicle rules with the county purchasing office; this wiki is not procurement counsel.

Two Texas-specific hooks. First, the Texas Commission on Law Enforcement (TCOLE) requires annual firearms proficiency for licensed officers, and that qualification cycle is the natural insertion point for test-and-evaluation pistols and armorer training. Second, an individual-officer purchase program (the pattern Glock's blue-label pricing set) builds bottom-up demand inside an agency before a contract exists: officers who shoot a bridge on their own time become the champions who put it on the commissioners court agenda.

Naming discipline

"2011" is a registered trademark of Staccato. This study uses "2011-pattern" descriptively, the way the industry press does. Commercial naming, packaging, and contract language use "double-stack 1911" or our own mark, and counsel clears the wordmark strategy before the first agency pitch, because the incumbent we sell against owns the word.

Investor / SBA package summary #

One paragraph for the deck: the bridge is a sub-27-ounce (bare), railed, optic-ready, double-stack pistol built on documented 1911 lockwork, offered in Series 70 and Series 80 fire-control variants, sold two ways: a consumer carry line, and a Texas-first law enforcement program modeled on the playbook Staccato already proved. The engineering package (Chapters 1-10) makes the product sentence defensible; Chapter 11 makes the revenue sentence checkable. Everything in this chapter is directional unless it cites a number from an earlier chapter.

Cost drivers (directional)

• Machining time: slide skeleton cuts, RMR pocket, and barrel lug geometry dominate unit cost. The Chapter 3 fit rules are the quality bar and the cycle-time problem at once.
• Coating line: hardcoat anodize plus Cerakote Elite plus NDLC means two or three vendor relationships or one capital line. Volume decides which.
• Magazines: outsourced from an established OEM until volume justifies tooling, with the Chapter 11 acceptance test applied per tube either way.
• Small parts: tool steel on the lockwork, metal injection molding (MIM) only where it has earned its place, NDLC on the wear faces per Chapter 8.
• Capital efficiency: one machining-center family serves both SKUs. The BOMs share the core and split only at fire control (Chapters 9, 10), which is the equipment-sizing story for the SBA file.

Revenue quality (the LE argument)

Agency contracts are multi-year, they bundle magazines, spares, armorer training, and support, and they create individual-officer pull-through on the consumer side. That is the revenue-quality argument for the loan file: the consumer line proves demand and absorbs volume, and the agency program adds contracted, referenceable revenue with switching costs. Chapter 11 names the procurement vehicles an underwriter can verify.

IP and process claims (honest scope)

Nobody patents the swinging link in 2026; the lockwork is over a century old and that is a feature, not a bug. Defensible ground is narrower and real: the skeletonization geometry and mass budget as industrial design, the coating and masking process specification, the per-serial fit documentation (gauge-pin witness records from Chapter 3), and our own trademark, chosen with the Chapter 11 naming discipline in mind. Trade dress and process discipline, not architecture patents.

Compliance path

• FFL Type 07 (manufacturer of firearms) before any commercial production, with serialization and marking per ATF rules. Under the 2022 frame-or-receiver rule, the serialized part of this design is the metal upper chassis that houses the fire control; the polymer grip module is not the firearm. That reading matches current 2011 industry practice, and we confirm it with an ATF determination letter before tooling, not after.
• Export controls, corrected from v1.0: since the 2020 Export Control Reform, semi-automatic handguns sit on the Commerce Control List (ECCN 0A501) under the Bureau of Industry and Security (BIS), not the ITAR Munitions List (85 FR 4136). No annual DDTC registration fee for this catalog; export licensing runs through BIS if we ever export. The v1.0 budget line for ITAR registration is reallocated (Chapter 13, item 5). If the line ever adds select-fire products for government sales, that work returns to ITAR.
• State roster strategy: for consumer expansion into roster states, the Series 80 SKU is the vehicle, and certification claims follow real drop testing. Texas agency sales do not depend on any roster (Chapter 11).
• Product liability: the Chapter 9 honesty label is a legal position as much as an ethical one. Documented fit records per serial support defense.

SBA framing (directional)

The package targets an SBA 7(a) loan for equipment and working capital under small arms manufacturing, NAICS 332994. The narrative the wiki supports: a defined product with audited engineering, two SKUs sharing one core, a costed BOM pair, a named government go-to-market, and a compliance-first operating plan. Job creation numbers, facility costs, and the three-year projection belong to the financial model, which is a separate document built after first-article quotes land.

Audit log: v1.0 to v2.0 #

This chapter is the paper trail for the v2.0 rebuild. Every v1.0 number was re-derived or traced to a source. The physics checks use conservation of momentum and published cartridge dimensions only, on purpose: those arguments need no interior-ballistics guesses and survive ammunition changes. Confirmed claims stay. Broken claims are corrected here, in the open, because a design study that hides its corrections is a brochure.

Added scope in v2.0

• Chapter 11, the law enforcement and government program: precedent, package, gates, and Texas procurement vehicles.
• The PHY tag for claims derived from first principles, with the calculation shown where the claim is made.
• Trademark hygiene for the word "2011" (Chapter 11), because the incumbent owns it.
• Duty configuration defined on the Series 80 SKU (Chapters 5, 10, 11).

Thesis verification matrix #

This chapter is the standing gate for the locked engineering thesis families. Chapter 13 records what changed between versions; this matrix records where every family stands right now, including what remains honestly untested. It began as an independent re-verification pass by a second model over the audited build; that pass re-derived the Chapter 4 physics and agreed with it, and its mass rows were refreshed after the live-sources pass (Chapter 13, item 14). Dispositions are Confirmed, Revised, or Untested.

Sources #

Primary sources for the SRC and STD tagged numbers and the platform background. Cached copies were pulled during the 2026-07-19/20 research sessions; the v2.0 audit added the standards, manufacturer, and government references below.

Gunsmithing and platform

• Gus Norcross, Fitting the 1911 Barrel, Part 2: Bottom Lugs, Firearms News, Feb 15 2013. Source for pin gauges, slide stop and frame hole diameters, lug cutters, the .196-.197 lockup target, and the even-contact test.
• Gus Norcross, Fitting the 1911 Barrel, Part 3: The Link, Firearms News, Feb 22 2013. Source for link sizes (.268-.288, .278 std), link pin diameters, the unlock-only rule, and the wiggle test.
• Recoil operation, Wikipedia. Operating-principle background for Chapter 4.
• M1911, Browning Hi-Power, STI International, Wikipedia. Platform history for Chapter 1.

Standards and specifications

• ANSI/SAAMI Z299.3, 9mm Luger cartridge and chamber dimensions. Source for the .754 in case length driving the Chapter 4 extraction floor.
• MIL-STD-1913 (Picatinny rail geometry), slot width and pitch used in Chapter 7.
• MIL-A-8625, anodic coatings for aluminum, Type III hardcoat requirement in Chapter 8.
• Trijicon RMR mounting footprint, current manufacturer drawing. Verification input for the Chapter 6 pocket before first article.
• Cerakote Elite and DLC/NDLC vendor technical data sheets. Directional only until our coupon testing (Chapter 8).

Manufacturer figures (directional, re-verify before use)

• Glock 19 specification page: 21.16 oz without magazine, 23.63 oz with empty magazine. Chapter 7 comparisons.
• Staccato C2 (25 oz, no optic or magazine) and Staccato P (33 oz, steel frame) specification pages, plus the Staccato law enforcement program. Chapters 7 and 11.
• Check-Mate 17-round 2011 magazine listing, 4.6 oz empty; the only live page found that states a weight, since manufacturer pages do not. Chapter 7 magazine line.
• CC Gunworks E2 2011 grip kit, polymer grip at 2.8 oz including mainspring housing. Chapter 7 grip cross-check.
• Commander bull barrel bare weight: no live page states one. Retail "weight" fields conflict (6, 8, 16 oz) and read as shipping weight, so Chapter 7 carries a volume-derived estimate to be replaced by a scale reading at first article.

Government, procurement, and compliance

• ATF final rule 2021R-05F, Definition of Frame or Receiver, serialization reading in Chapter 12.
• 85 FR 4136 and BIS firearms guidance, the 2020 export-control transfer behind the Chapter 12 correction.
• Texas Local Government Code Chapter 262, county purchasing framework in Chapter 11.
• BuyBoard, TIPS, HGACBuy, TXMAS, cooperative purchasing vehicles in Chapter 11.
• GSA 1122 Program, federal-channel purchasing for state and local counter-drug missions, Chapter 11.
• Texas Commission on Law Enforcement, annual firearms proficiency context in Chapter 11.
• SBA 7(a) loan program and NAICS 332994, business framing in Chapter 12.