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5.56 NATO 14.5" Parkerized M4 Barrel - 1:7 Twist - Carbine Length Gas System
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5.56 NATO 10.5" Black Nitride M4 Profile Barrel - 1:7 Twist Carbine Length Gas System
5.56 NATO 20" Parkerized Heavy Barrel - 1:7 Twist - Rifle Length Gas System
AR-15 8.5" M4 Profile Barrel, .223/5.56NATO, Parkerized Finish, 1:7 Twist
Ballistic Advantage Performance Series AR-15 10.3" 5.56x45mm, Carbine Length, Hanson Profile Barrel with Low Profil
Aero Precision AR15 Complete Upper with No Forward Assist 16" 5.56 Mid-Length Barrel, 15" M-LOK ATLAS R-ONE Ha
Aero Precision M4E1 Special Edition Thunder Ranch 14.5" 5.56 Mid-Length with 12" Atlas R-ONE Complete Upper Re
Aero Precision M4E1 Threaded 12.5" 5.56 Carbine Length Complete Upper Receiver w/ ATLAS R-ONE Handguard - Cerakote
Ballistic Advantage Modern Series AR-15 20" 5.56x45mm, Government Profile Barrel - BABL556026M
Del-Ton Inc DT1040 Complete Upper Assembly 5.56x45mm NATO 16" Mid Length Chrome Moly Vanadium Barrel 15" M-LOK
Bushmaster 0040017BLK QRC Complete Upper 5.56x45mm NATO 16" CMV Nitride Barrel, Black, Flat Top Aluminum Rec, A2 Fl
CMMG 55B8D86-SG Dissent 5.56x45mm 10.50" 7075-T6 Aluminum 9.60" M-LOK Handguard