5.56x45mm NATO Receiver Parts

Brn-4 Upper Receiver Build Kits - Brn-4 Upper Receiver Build Kit, 14.5'''' Medium Barrel

Brn-4 Upper Receiver Build Kits - Brn-4 Upper Receiver Build Kit, 10.4'''' Medium Barrel

Xm177e2 Complete Upper Receiver & 4x Retro Carry Handle Scope - Xm177e2 Upper Receiver 11.5'''' 1-7 & Retro Colt 4x Optic (Dupe

Xm177e2 Complete Upper Receiver & 4x Retro Carry Handle Scope - Xm177e2 Upper Receiver 11.5'''' 1-12 & Retro Colt 4x Optic (Dup

Xm177e2 11.5''''Adeg W/Colt Optic - Brn Xm177e2 5.56mm 11.5''''bbl 1-12 Twt Upper Pin/Weld W/4x21mm

Xm177e2 12.7'''' Carbine Length Pinned/Welded W/Colt Ar-15 Optic - Brn Xm177e2 5.56mm 12.7'''' Bbl 1-7 Twt Upper Pin/Weld W/4x21mm

M16a1 20'''' Rifle Length Upper W/Colt Ar-15 4x21mm - Brn-16a1 5.56x45 Nato 20'''' Bbl 1-12 Twist Upper W/Colt 4x21mm

Dd 10.3'''' Mk18 Riii Upper Receiver W/ Eotech Optics - Dd 10.3'''' Mk18 Riii Upper W/ Exps3-0 Holographic Red Dot

Dd 10.3'''' Mk18 Riii Upper Receiver W/ Eotech Optics - Dd 10.3'''' Mk18 Riii Upper W/ Exps2-0 Holographic Red Dot

Dd 14.5'''' M4a1 Somcom Upper Receiver W/ Eotech Optic - Dd 14.5'''' M4a1 Socom Upper W/ Exps2-0 Holographic Red Dot

Dd 10.3'''' Mk18 Socom Upper Receivers W/ Optics - Dd 10.3'''' Mk18 Socom Upper W/ Exps2-0 Holographic Red Dot

Brn16a2 20'''' Upper W/Colt Ar-15 4x21mm - Brn-16a2 5.56x45 Nato 20'''' Bbl Upper Receiver W/Colt 4x21mm

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