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7.62x39

Picking a barrel for an AR-15 usually means working out the gas system length, gas block size and muzzle thread yourself, then installing it like a gunsmith, with a torque wrench and an armorer's wrench. With MBZ, you just choose the caliber and the length, and the kit ships complete with the barrel ready to swap.

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7.62x39

MBZ Barrel Kit – 7.62x39 16" – Adapter Mounted