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Firing pins are one of those parts nobody thinks about until the day one lets go mid-mag. For anyone running a CMMG .22 LR AR conversion kit or a dedicated 22ARC bolt group, this stainless steel firing pin is the exact OEM piece that lives inside the bolt and touches off the round. It's an inexpensive component that carries a lot of responsibility, and when it starts wearing down you'll see light strikes, dry fires, and general grumpiness on the range. Swapping in a fresh one gets everything running clean again.
CMMG machines these on in-house CNC Swiss turning centers from domestic 17-4 stainless steel, then heat treats them into the Rc44 to Rc47 range for a solid balance of hardness and durability. The pins come unfinished and carry a darker coloring left over from the heat treating process, so don't be thrown off if yours looks a little toasty out of the package. That's the tempering doing its job, not a defect.
This is the OEM firing pin designed around CMMG's 22LR AR conversion bolt, and it plays nicely with CMMG dedicated .22 LR bolt groups as well as similar-style conversion setups. The rimfire conversion runs on straight blowback, so the pin does its work in a simple, high-round-count environment where a fresh, properly hardened pin genuinely matters. Installation is straightforward for anyone comfortable pulling a .22 bolt apart, usually a matter of driving out the retaining pin, dropping the firing pin and spring in, and buttoning it back up.
Rimfire ammo is dirty and .22 conversion kits run hard, which means firing pins are wear items by nature. Tossing a spare in your range bag is cheap insurance against a cut-short session, and CMMG backs its parts against defects in material or workmanship for the life of the product. Made in the USA, and priced like the kind of part you buy two of.
It's the OEM firing pin for CMMG's 22LR AR conversion bolt and works with CMMG dedicated .22 LR bolt groups. It'll also drop into similar-style .22 conversion kits that use the CMMG pin design. If you're running a CMMG .22 upper or conversion kit, this is the pin you want.
The pins come unfinished and keep the darker coloring left behind by the heat treating process. It's completely normal and not a sign of damage or rust. That heat treatment is what brings the 17-4 stainless up to its Rc44 to Rc47 hardness.
No specialty tools required for most setups. You typically drive out the retaining or cotter pin, remove the old firing pin and spring, drop in the new one, and reinstall the pin. Anyone comfortable field stripping a .22 conversion bolt can knock it out in a few minutes.
There's no fixed interval, but firing pins are wear items, especially in dirty, high-volume rimfire use. Watch for light primer strikes or increased malfunctions as a sign it's time for a fresh one. Keeping a spare in your range bag is smart, cheap insurance against a session cut short.
| UPC | 815835012100 |
|---|---|
| Manufacturer | |
| Manufacturer Part Number | 22BA434 |
| Model |
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