The DS Arms ZM4 carrier is a commercial, semi-auto-only, 223 Remington AR-15 complete bolt carrier assembly. This assembly includes a bolt carrier with staked key, bolt, firing pin, cam pin and firing pin retainer. The bolt carrier and bolt are finished with NP3 nickel boron coating. The NP3 is a slick surface coating that will clean easily and withstand corrosive environments for extended periods.
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