CMMG .22ARC Stainless Steel Firing Pin — Replacement for CMMG .22LR AR Conversion/Upper Bolt Groups (Part 22BA434 | UPC 815835012100)
Keep your rimfire trainer running flawlessly with the CMMG .22ARC Stainless Steel Firing Pin. Purpose-built as a factory-spec replacement for CMMG .22LR AR-pattern conversion bolts and dedicated .22ARC/.22LR bolt groups, this precision-machined pin restores reliable rim strikes, cleaner ignition, and consistent function across high round counts. Whether you’re refreshing a hard-used trainer, stocking spares for a class, or troubleshooting light strikes, 22BA434 delivers the fit, hardness, and corrosion resistance you expect from genuine CMMG parts.
Why upgrade/refresh with 22BA434
Factory-Spec Geometry: Correct rimfire tip shape and travel for consistent rim strikes and reduced light- or misfire events.
Stainless Steel Durability: Heat-treated stainless resists peening, galling, and corrosion, extending service life in high-volume training.
Drop-In Replacement: Built to CMMG dimensions to fit CMMG .22LR/.22ARC bolt assemblies without guesswork.
Reliability Booster: A fresh firing pin is a fast, low-cost fix for light strikes, intermittent ignition, or sluggish cold-weather performance.
Train More, Tinker Less: Keep a spare on hand so a worn pin never ends a range session or class early.
Compatibility (read before purchase)
Intended for: CMMG .22LR/.22ARC conversion bolt carrier groups and CMMG dedicated .22 uppers using the CMMG-style rimfire bolt.
Not for: Centerfire AR-15/M16 bolts or non-CMMG proprietary .22 systems.
Pro tip: If you’re unsure, compare your current firing pin profile to product photos/specs on your retailer’s listing or consult the CMMG manual.
Common symptoms a new firing pin solves
Light strikes or shallow rim indentations on spent cases.
Intermittent ignition across different ammo brands.
Visible tip wear/rounding, burrs, or deformation on the old pin.
Rust or pitting from storage or harsh cleaning chemicals.
Quick installation overview
Unload & verify clear. Separate upper/lower; remove the CMMG .22 bolt from the upper.
Disassemble bolt. Follow CMMG instructions to access the firing pin channel (retain small pins/clips).
Inspect & clean. Flush carbon/lead from the channel; check the firing pin spring and retaining parts.
Install new pin. Lightly lube, insert 22BA434, and reassemble per the manual.
Function check. Ensure free firing pin movement, then test with your preferred .22LR ammunition.
Maintenance tip: On high-volume trainers, replace the firing pin spring and extractor components on the same schedule for maximum reliability.
Best practices for .22LR AR trainers
Ammo selection: Rimfire ignition varies—log which loads give the most consistent rim strikes in your setup.
Cleaning cadence: Lead and carbon build up quickly; clean the firing pin channel regularly to maintain energy and lock-time.
Spare parts kit: Keep on hand: firing pin (22BA434), firing pin spring, extractor, extractor spring, and a few small retaining pins.
Specifications
Brand: CMMG
Part: .22ARC Stainless Steel Firing Pin
Part Number: 22BA434
UPC: 815835012100
Material: Heat-treated stainless steel
Application: CMMG .22LR/.22ARC conversion & dedicated rimfire bolt groups
Function: Restores proper rimfire strike for reliable ignition
What’s in the package
Who it’s for
Rimfire trainers & competitors who put thousands of rounds on a CMMG .22 AR
Instructors & ranges maintaining fleets of training rifles
Prepared owners who want mission-critical spares in the range bag
SEO-Friendly Keywords (Use Naturally on Your Product Page)
CMMG 22ARC firing pin, 22BA434, stainless firing pin for CMMG 22LR conversion, CMMG .22LR bolt firing pin replacement, AR-15 .22 conversion parts, rimfire AR firing pin, CMMG small parts, UPC 815835012100.
Small part, huge uptime. Swap in the CMMG .22ARC Stainless Steel Firing Pin (22BA434) to restore crisp rim strikes and keep your rimfire AR trainer humming through every drill and class.
The End
