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NBS Mil-Spec 6 Position Receiver Extension / Buffer Tube
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Dirty Bird 7075-T6 True Mil-Spec Carbine Receiver Extension / Buffer Tube
KAK AR-15 / LR-308 A2 Standard Rifle Buffer Tube
Strike Industries AR Carbine Length Pistol Receiver Extension Buffer Tube
KAK Industry A5 Style 9-Position Buffer Tube
