5.56x45mm NATO Receivers

LMT Defense MRP-L M-LOK SPECWAR Assembled Upper 5.56

LMT Defense MRP-L Quad Assembled Upper Receiver 5.56/300 BLK 13.25

Luth-Ar M16 A1 5.56 NATO AR-15 Assembled Upper Receiver

Luth-Ar M16 A1 Stripped Upper Receiver AR-15 5.56 NATO

Ar-15 Stripped Upper Receiver - 5.56x45 Nato Stripped Upper Receiver For Ar-15 Black

Colt AR-15 Pistol Complete Upper Receiver 5.56x45mm NATO 14.5" Barrel CMR M-LOK Handguard

Aero Precision M4E1 Standard Assembled AR-15 Upper Receiver Aluminum Flat Dark Earth

Aero Precision Standard Assembled AR-15 Upper Receiver Aluminum Flat Dark Earth

LMT Defense MRP-L Quad Assembled Upper Receiver 5.56/.300 Blackout

Colt Firearms LE6933 Complete Upper 5.56 NATO / .223 Rem 11.5 Barrel

Colt Monolithic AR-15 Pistol Complete Upper Receiver 5.56x45mm NATO 10.3" Barrel

Aero Precision M4E1 Standard Assembled AR-15 Upper Receiver Aluminum Anodized Kodiak Brown

Aero Precision M4E1 Standard Assembled AR-15 Upper Receiver Aluminum Anodized Olive Drab

Aero Precision AR-15 Barreled Upper Receiver 5.56x45 NATO 16" Barrel

STRIKE INDUSTRIES Billet Ultimate Dust Cover .223/5.56 Blue

Aero Precision AR-15 Barreled Upper Receiver 5.56x45mm NATO 16" Barrel MOE SL Mid-Length Handguard Black

AERO PRECISION AR15 Stripped Upper Receiver FDE

SADLAK Ejection Port Door Cover Assembly, Black

Aero Precision Standard Upper Receiver Assembled AR-15 Aluminum Olive Drab Green

Aero Precision AR-15 M4E1-E Barreled Upper Receiver 5.56x45mm NATO 10.5" Barrel 9.3" ATLAS R-ONE Handguard Black

Aero Precision M4E1 Standard Stripped AR-15 Upper Receiver Aluminum Flat Dark Earth

Ar-15 Upper Reciever Assembled - Ar-15 Upper Reciever Assembled Black 5.56mm

One Horse Complete Upper 5.56 16 Barrel

AERO PRECISION M4E1-T 5.56 NATO 11.5" Complete Upper Receiver | Black