5.56x45mm NATO Receivers

733 C7 11.5'''' Upperr W/Colt Ar-15 4x21mm Optic - 733 C7 11.5'''' Upper W/Colt Ar-15 4x21mm

M4a1 Riii 14.5'''' Stripped Upper Receivers W/ Law Folder - M4a1 Riii 14.5'''' Stripped Upper W/ Law Folder Fde

M4a1 14.5'''' Stripped Socom Upper Receivers W/ Law Folder - M4a1 14.5'''' Stripped Socom Upper W/ Law Folder Fde

Mk18 10.3'''' Stripped Socom Upper Receiver W/ Law Folder - Mk18 10.3'''' Stripped Socom Upper W/ Law Folder Fde

Brn-4 Piston Upper Receiver Kits - Brn-4 10.4'''' Upper Receiver Kit W/ Medium Profile Barrel

Brn-4 Piston Upper Receiver Kits - Brn-4 16'''' Upper Receiver Kit W/ Medium Profile Barrel

Brn-4 Piston Upper Receiver Kits - Brn-4 14.5'''' Upper Receiver Kit W/ Medium Profile Barrel

M4 5.56 Complete Monolithic Upper Receiver Groups - M4 Le6940 Upper Group 16in Stripped

Ar15a4 Upper Rcvr, Flattop, Mod. Carb

Ar15a4 Upper Rcvr Assembly, Carbine

Aero Ar-15 Assembled Upper 5.56mm Build Kits - Build Kit 5.56mm Assembled Upper 16'''' Carbine 12'''' Hg Black

Aero Ar-15 Assembled Upper 5.56mm Build Kits - Build Kit 5.56mm Assembled Upper 16'''' Mid-Length 12'''' Hg Black

5.56mm Complete Upper Receiver W/Brn Bolt Carrier Group - 5.56mm 16'''' Bbl M4 Comp Uppr Rcvr W/Brn Bcg & Charge Handle

Ar-15 Forged M4 Upper Receiver 5.56mm - Ar-15 Forged M4 Stripped Upper Receiver

East India 5.56x45 Assembled Upper Receiver Starter Kit For Ar15 - East India 5.56x45 Assmb Upper Medium 16'''' Bbl W/Rail & Fsb

East India 5.56x45 Assembled Upper Receiver Starter Kit For Ar15 - East India 5.56x45 Assembled Upper Medium 10.5'''' Bbl W/Rail

Ar-15/M16 Engraved Ejection Port Covers - Ar-15 ''''don'T Tread On Me''''/U.S. Flag

Ar-15 M4 Build Kit M-Lok 5.56mm - Ar15 16'''' M4 Build Kit M-Lok Black

Ar-15 M4 Upper Receivers M-Lok 5.56mm - Ar-15 16'''' M4 Upper Assy 5.56 No Bcg/Charging Handle

Ar-15 M4 Upper Receivers M-Lok 5.56mm - Ar-15 16'''' M4 Complete Upper Assembly

Ar-15 M16 A1 Upper Receiver - Brn-16a1 M16a1 Upper Receiver Black

Ar-15 Stag 15 16'''' Upper Build Kit 5.56mm - Ar-15 Stag 15 16 Upper Build Kit 5.56mm

Ar-15 M4e1-T 14.5'''' Upper Build Kit 5.56mm - Ar-15 M4e1-T 14.5 Upper Build Kit 5.56mm

Ar-15 M4e1 16'''' Upper Build Kit 5.56mm - Ar-15 M4e1 16 Upper Build Kit 5.56mm