5.56x45mm NATO Receiver Parts

Colt Monolithic AR-15 Pistol Complete Upper Receiver 5.56x45mm NATO 14.5" Barrel

PRI Mark 12 Mod 0 AR-15 Complete Upper Receiver 5.56x45mm NATO 18" Barrel 1:8" Twist Flat Dark Earth

Brn 16a2 Upper Receiver - Brn-16a2 5.56x45 Nato 20'''' Bbl Upper Receiver

Brn-16a4 Complete Upper Receiver - Brn-16a4 5.56x45 Nato 20'''' Bbl Upper Receiver

Brn-773 Upper Receiver - Brn 733 C7 5.56 Upper Receiver, 11.5'''' 1-7 Twist Black

Brn-601(R) Retro Complete Upper Receiver - Brn-601 5.56mm 20'''' Bbl Upper Receiver

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 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

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

Ar-15 Mike-15 Gen 2 Upper Receiver Assembly 223 Wylde - Ar-15 5.56/223 Wylde 13.9'''' Gen2 Upper Rec Forward Charging

Mk18 Stripped Socom Upper Receiver W/ Handguard Only - Mk18 Stripped Socom Upper Receiver

Ar-15 Super Duty Stripped Upper Receivers 5.56mm - Ar-15 18 Super Duty Stripped Upper Receiver Ddc

Ar-15 Super Duty Stripped Upper Receivers 5.56mm - Ar-15 18 Super Duty Stripped Upper Receiver Black

Mrp-L M-Lok 5.56mm Assembled Upper Receiver - Mrp-L M-Lok 5.56/300 Blk 9.25'''' Assembled Upper Receiver

Ar-15 Lightweight Upper Receiver W/ Slim Line Handguards - Ar-15 16'''' Lightweight Upper W/ 15'''' M-Lok Slh Rail

Ar-15 Lightweight Upper Receiver W/ Slim Line Handguards - Ar-15 16'''' Lightweight Upper W/ 12'''' M-Lok Slh Rail

5.56x45 Nato Complete Upper Receiver - Kak Forged Complete Upper, 16" 5.56 Nato Mid Gas 13" Mlok

K-Spec 5.56x45mm Nato Complete Upper Receiver - K-Spec 5.56 Nato 16'''' Bbl 1-7 Twist Complete Upper Black

Hk33, Hk53 202032 Catch, Magazine, Comp., - Catch, Magazine, Comp.,