5.56x45mm NATO Upper Receivers

Brn-4(R) Complete Upper Receivers - Brn-4 5.56mm 10.4'''' Heavy Bbl Complete Upper W/9'''' Handguard

Brn-4(R) Complete Upper Receivers - Brn-4 5.56mm 16'''' Med Bbl Complete Upper W/13.5'''' Handguard

Brn-4(R) Complete Upper Receivers - Brn-4 5.56mm 14.5'''' Med Bbl Complete Upper W/13.5'''' Handguard

Brn-4(R) Complete Upper Receivers - Brn-4 5.56mm 10.4'''' Med Bbl Complete Upper W/9'''' Handguard

Brn-4(R) Upper Receiver Assemblies With Chrome Lined Barrels - Brn-4 Assembled Upper 14.5'''' Heavy Chrome Lined Barrel Black

Gau-5a 12.7'''' 1-12 Upper Receivers - Brn-Gau-5a Upper Receiver, 12.7'''' 1-12 Twist, Pin/Weld, Black

Xm177e2 Complete Upper Receivers - Brn Xm177e2 Upper Receiver, 11.5'''', 1-7 Twist, Black

Xm177e2 Complete Upper Receivers - Brn Xm177e2 Upper Receiver, 12.7'''' 1-7 Twist, Pin/Weld, Black

Brn16a1(R) 20'''' Complete Upper Receivers - Brn M16a1 Upper Receiver 20'''' Rifle Length, 1-7 Twist, Black

Brn-15 Upper Receivers 5.56mm Nato - Brn-15 5.56mm 11.5'''' Bbl .750'''' Gas Block Upper Receiver

Brn-15 Upper Receivers 5.56mm Nato - Brn-15 5.56mm 16'''' Bbl .625'''' Gas Block Upper Receiver

Brn-15 Upper Receivers 5.56mm Nato - Brn-15 5.56mm 16'''' Bbl .750'''' Gas Block Upper Receiver

Brn-180s(R) Gen2 13.9/14.5 223/5.56 Complete Upper Receiver Assy - Brn-180 Gen 2 13.9'''' 223 Wylde Upper Receiver Assy Black

Brn-180s(R) Gen2 13.9/14.5 223/5.56 Complete Upper Receiver Assy - Brn-180s Gen 2 14.5'''' 223 Wylde Upper Receiver Black

Gemtech GVAC Complete Upper 5.56 / .223 Rem 11.5 Barrel w/ ETM Flash Hider

Black Rain Spec15 223 Remington/5.56 NATO 7075-T6 Aluminum Black Ha

Sons Of Liberty Gun Works M4-EXO3 5.56 AR-15 Barreled Upper Receiver Group - 13.7"

SLR Rifleworks Billet Upper SLR 556

Colt Assembled AR-15 Upper Receiver Aluminum Black

Centurion Arms AR-15 CM4 Forged 5.56 Stripped Thermal Fit Upper Receiver

DPMS M-LOK TPR A3 Upper 20" 5.56/223 Rem 30rd

DPMS LBR, Muddy Girl Camo, A3 Upper

DPMS Complete Upper Barrel Assembly 556 Nato LBR 60583

DPMS 223 A1 16-inch LW Barrel Assembly