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Faxon Firearms Duty Carbine-Length Button Rifled Gunner Big Bore Barrel .450 Bushmaster 16", Black

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FN America AR-15 16" Barrel 556NATO 1:7 Twist Button Broached, Black - 20100039

Ballistic Advantage Performance Barrel 5.56x45mm 13.70", Black - Compact and Efficient Barrel - BABL556036F

DPMS KITTY KAT 5.56 7.5IN BARREL A4 QUAD RAIL CAR BRACE FDE DP51655227754

Faxon Firearms Mid-Length Button Rifled Gunner Barrel 5.56x45mm 16", Black