5.56x45mm NATO Upper Receivers

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

KAK AR-15 Upper Receiver Completion Kit Forward Assist/Ejection Port Cover

ZRODelta Mil-Spec Barrel Extension 5.56 M4 Nitride Black Small

SLR B15 Billet Upper 5.56 Receiver Black SLRB-15-UPP 556

BattleHawk Armory AR-15 16 Government Profile 5.56mm, 15 Handguard, Black, Upper Receiver

BattleHawk Armory AR-15 16 Gov Profile 5.56 NATO 15 M-LOK Handguard Black Upper Receiver

BattleHawk Armory AR-15 16 Pencil Profile 5.56mm, 15 Handguard, Black, Upper Receiver

ABC RIFLE COMPANY AR-15 Sleek Billet Stripped Upper Receiver Cerakote White

ABC RIFLE COMPANY AR-15 Custom Billet Modular Stripped Upper Receiver Red

ABC RIFLE COMPANY AR-15 Billet Stripped Upper Receiver Cerakote Red

ABC RIFLE COMPANY AR-15 Billet Stripped Upper Receiver Cerakote Bronze

ABC RIFLE COMPANY AR-15 Custom Billet Modular Stripped Upper Receiver Sniper Grey

ABC RIFLE COMPANY AR-15 Custom Billet Modular Stripped Upper Receiver Olive Drab Green

ABC RIFLE COMPANY AR-15 Custom Billet Modular Stripped Upper Receiver Flat Dark Earth

ABC RIFLE COMPANY AR-15 Custom Billet Modular Stripped Upper Receiver Raw

ABC RIFLE COMPANY AR-15 Custom Billet Modular Stripped Upper Receiver Black

ABC RIFLE COMPANY AR-15 Sleek Billet Stripped Upper Receiver Black

ABC RIFLE COMPANY AR-15 Engraved Ejection Port Dust Cover Assembly 5.56x45mm NATO Black

ABC RIFLE COMPANY AR-15 Rifle Build .223/5.56x45mm NATO 16in Barrel 15in M-LOK Handguard Upper Receiver Parts 1/2x28 Black

ABC RIFLE COMPANY AR-15 Micro Pistol Build 5.56x45mm NATO 5in Barrel 4in M-LOK Handguard Upper Receiver Bronze

ABC RIFLE COMPANY AR-15 Micro Pistol Build 5.56x45mm NATO 5in Barrel 4in M-LOK Handguard Upper Receiver Black

ABC RIFLE COMPANY AR-15 Micro Pistol Build 5.56x45mm NATO 5in Barrel 4in M-LOK Handguard Upper Receiver Tungsten

ABC RIFLE COMPANY AR-15 Micro Pistol Build 5.56x45mm NATO 5in Barrel 4in M-LOK Handguard Upper Receiver Olive Drab Green

ABC RIFLE COMPANY AR-15 Micro Pistol Build 5.56x45mm NATO 5in Barrel 4in M-LOK Handguard Upper Receiver White