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The F-1 Firearms DuraBolt Black Nitride direct impingement full auto rated M16/M4 bolt carrier group” for use in AR15 platforms” is compatible with MIL-SPEC receivers and associated components. The bolt carrier and bolt are ground after heat treat to ensure tolerances.

F-1 True Black 5.56 DuraBolt

$275.99Price
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    HAND GUNS

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