Bolt Carrier for Western Arms, G&P and King Arms GBB M4 Stock replacement part for the bolt carrier on your Western Arms, G&P or King Arms gas blowback m4 airsoft rifle. It is constructed of high grade aluminum, keeping it fairly lightweight while still being durable enough to stand up to constant use, and it features functional forward assist grooves. Zinc alloy Metal Construction . Weight(Gram): 205
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