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5.56 NATO 10.5" Black Nitride M4 Profile Barrel - 1:7 Twist Carbine Length Gas System
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Bushmaster 0040017BLK QRC Complete Upper 5.56x45mm NATO 16" CMV Nitride Barrel, Black, Flat Top Aluminum Rec, A2 Fl
AR-15 10.5" .223 Wylde Black Nitride M4 Barrel 1:7 Twist Carbine Length Gas System
Wolf Performance A1 Complete Upper 12.5" 5.56 NATO 1:7 Piston Driven
Colt Defense Un-issued Prototype IAR (Infantry Assault Rifle) Upper Receiver W/ Knights Armament Flip-up Sights - 16&quo
Anderson Manufacturing 300 Blackout 16" Barrel - 1:7 Twist - M4 Medium Contour - Carbine Length Gas System - B2-K00
CMMG 55DC70A Barrel Assembly .223/5.56 NATO 16.1" Nitrided
CMMG 55DE10A Barrel Assembly .223/5.56 NATO 16.1" Nitrided
Wolf Performance A1 Complete Upper 16" 5.56 NATO 1:7 Piston Driven
Wolf Performance A1 Complete Upper 14.5" 5.56 NATO 1:7 Piston Driven