Shop 4,464 Deals on Upper Receivers

Grid Defense Complete Upper Receiver .300 Blackout 16 inch Pistol Length 4150 Light HBAR Barrel 1-8 Twist 14 inch M-LOK Rail A2 Flash Hider Blue

Grid Defense Complete Upper Receiver .300 Blackout 10.5 inch Pistol Length 4150 Steel Light HBAR Barrel 1-8 Twist 10.5 inch Hand Guard A2 Flash Hider

Grid Defense Complete Upper Receiver .300 Blackout 7.5 inch Pistol Length 4150 Light HBAR Barrel 1-8 Twist 9 inch Octagon M-LOK Hand Guard Dimpled

Bear Creek Arsenal BC-15 .223 Wylde 16in Upper Receiver Heavy Carbine 1-8 1/2x28 Flash Hider Parkerized ODG

Bear Creek Arsenal BC-15 6mm ARC 18in Upper Receiver Heavy Mid-Length 1-8 5/8x24 Flash Hider Parkerized FDE

Bear Creek Arsenal BC-15 5.56 NATO 16in Upper Receiver M4 Carbine 1-7 1/2x28 Flash Hider Black Nitride ODG

Bear Creek Arsenal BC-10 .308 Winchester 16in Upper Receiver Heavy Mid-Length 1-10 5/8x24 Flash Hider Parkerized FDE

Bear Creek Arsenal BC-15 .300AAC 16in Upper Receiver Heavy Carbine 1-8 5/8x24 Flash Hider Parkerized ODG

Bear Creek Arsenal BC-15 .350 Legend 10.5in Bolt Action Style Upper Receiver Heavy 1-16 5/8x24 Flash Hider Parkerized

Bear Creek Arsenal BC-15 .223 Wylde 16in Bolt Action Style Upper Receiver Straight Heavy 1-8 1/2x28 Flash Hider 416R

Bear Creek Arsenal BC-10 .308 Winchester 20in Bolt Action Style Upper Receiver SOCOM 1-10 5/8x24 Flash Hider 416R

Bear Creek Arsenal BC-15 7.62x39 7.5in Bolt Action Style Upper Receiver Heavy Barrel 1-10 Twist 5/8x24 Flash Hider Parkerized

Bear Creek Arsenal BC-15 .300 Blackout 10.5in Bolt Action Style Upper Receiver Heavy 1-8 Twist 5/8x24 Flash Hider Parkerized

Outerwild AR15 Complete Premium Upper Receiver 5.56NATO 16in 1-7 Twist 13in M-LOK Handguard Black Anodize

Stag Arms AR-15 A3 Stripped Upper Receiver Left Hand Cerakote FDE

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

ABC RIFLE COMPANY AR-15 7.62x39mm Micro Pistol Build 5in Barrel 4in M-LOK Handguard Upper Receiver Flat Dark Earth

Sons of Liberty Gun Works East India Starter Kit Combat Grade FSB 11.5in w/ Front Sight Base Black

Aero Precision M4E1-E Complete Upper 16in 5.56 Mid-Length BRL EM-15 Gen2 HG W/BCG/CH Flat Dark Earth

CMMG Mk4/AR15 Upper Receiver Assembly Charcoal Green

CMMG 5.7X28mm Banshee Upper Group Receiver 5in 1-9 Twist 1/2 X 28 TPI 13.8in Sniper Grey

IMG AR-15 .410 19.25in Complete Upper Receiver w/10 Roumd Magazine Black

JARD AR Side Charge .223/5.56 Upper Receiver Assembly Complete Black

Grid Defense Complete Upper Receiver 9mm 9x19 Para 7.5 inch 4150 Light HBAR Barrel 1-10 Twist 7 inch Octagon M-LOK Rail A2 Flash Hider OD Green