The A*B Arms Pro 5.56mm Firing Pin is a mil-spec replacement firing pin from American Built Arms Company (A*B Arms), machined for reliable ignition in AR-15 pattern bolt carrier groups. It's a straightforward, drop-in spare-parts item — the kind of budget-friendly upgrade or backup builders keep on hand for maintenance or a range-bag repair kit.
- Platform : AR-15 / 5.56mm NATO-pattern bolt carrier groups
- Material : 420 stainless steel
- Finish : Passivated (bare stainless, no coating)
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