Shop 4,481 Deals on Upper Receivers

CMMG Mk4/AR15 Upper Receiver Assembly Midnight Bronze

CMMG Mk4 6.5 Grendel Resolute Upper Group Receiver 16.1in Tungsten

CMMG MkG .45 ACP Resolute Upper Group Receiver 16.1in Midnight Bronze

V Seven Harbinger 308 Complete Upper 1-10 twist 5/8x24 Thread Ultralight 16in Black 16HAR 308 FLT-UR

V Seven Enlightened 556/223 Complete Upper 16in 16 ENLI 556 FLT-UR

HIPP Customs Complete Upper Receiver 25.5in 16in Barrel 1-7 Twist Hipp Lite Weight Handguard Black/Orange 16.0in

Matrix Arms Stripped Upper Receiver 5.56mm Hardcoat Anodized Black

Bear Creek Arsenal BC-15 5.56 NATO 16in Upper Receiver M4 Cold Hammer Forged Carbine 1-8 1/2x28 Flash Hider Black Nitride ODG

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

Bear Creek Arsenal BC-15 7.62x39 16in Upper Receiver Heavy Carbine 1-10 1/2x28 Flash Hider Parkerized FDE

Grid Defense Complete Upper Receiver 9mm 9x19 Para 5.5 inch 4150 Light HBAR Barrel 1-10 Twist 7 inch Octagon M-LOK Rail Dimpled Flash Can Burnt Bronze

Grid Defense Complete Upper Receiver 7.62x39 16 inch Carbine Length 4150 Light HBAR Barrel 1-10 Twist 14 inch M-LOK Free Float Hand Guard A2 Flash

Spikes Tactical Upper 5.56 16in CHF Midlength w/ 13.2in BAR2 Rail

Spikes Tactical Upper 5.56 14.5in 16in OAL CHF Midlength w/ML Hanguard and Dynacomp Muzzle Device Black

AT3 Tactical Tactical AR-15 Slick Side Billet Upper Receiver Pink

CMMG DISSENT Mk4 5.56x45mm NATO 6.5in Upper Receiver 1-7 Twist .750in 1/2 X 28 TPI Charcoal Green

CMMG MkG .45 ACP Resolute Upper Group Receiver 16.1in Titanium

Luth-AR Complete Upper Receiver Assembly .223 27in 18in Bull Rifle 1x9 1/2x28 Picatinny Key MOD A2 Flash Hider Anodized Manganese Phosphate Silver/

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

ABC RIFLE COMPANY AR-15 .300 AAC Blackout Pistol 10in Quadrail Handguard Complete Upper Receiver w/BCG And Charging Handle Tungsten

ABC RIFLE COMPANY AR9 9mm Luger Pistol Billet 4in Barrel M-LOK Handguard Complete Upper Receiver w/BCG And Charging Handle Cerakote Olive Drab Green

ABC RIFLE COMPANY AR-15 .223 Remington/5.56x45mm NATO Pistol 7in Barrel Custom 7in Top Cut Hybrid M-LOK Handguard Complete Upper Receiver w/BCG And

Guntec USA AR-15 Stripped Billet Upper Receiver w/15in Air Lite Series Keymod Handguard Anodized Red

V Seven Harbinger 308 Complete Upper 1-10 twist 5/8x24 Thread Ultralight 20in Black 20HARB 308-UR