Shop 4,464 Deals on Upper Receivers

Aero Precision M5 Complete Upper Receiver 16in .308 Mid Barrel w/ATLAS R-ONE 12in M-LOK Handguard Anodized Black

Bear Creek Arsenal BC-15 5.56 NATO 16in Bolt Action Style Upper Receiver M4 Barrel 1-7 Twist 1/2x28 Flash Hider Black Nitride

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

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

ABC RIFLE COMPANY AR-15 7.62x39mm 16in Barrel 15in Lightweight Hybrid M-LOK Handguard Complete Build Upper Receiver 1-10 Twist 5/8x24 A2 Style Muzzle

CMMG Upper Receiver Assembly Mk4/AR15 Forward Assist Coyote Tan

CMMG Mk4/AR15 Upper Receiver Assembly Coyote Tan

CMMG Mk4 9mm Resolute Upper Group Receiver 16.1in Sniper Grey

CMMG Mk4 6.5 Grendel Resolute Upper Group Receiver 16.1in Coyote Tan

CMMG Mk4 .22LR Banshee Upper Group Receiver 4.5in 1-16 Twist 1/2 X 28 TPI 12.8in Sniper Grey

Geissele 5.56 Super Duty MOD 1 Upper Reciever .750 16 in DDC

Next Level Armament NLX556 AR15 556 Nato 16in Complete Upper Receiver Midlength 1-7 Twist Black

XTS Complete Upper Receiver w/o BCG AR-15 223/5.56 19.5in 10.5in Carbinel Government 1-7 Twist 1/2x28 Thread M-LOK Bird Cage Black Nitride Finish

V Seven Gi Heavy 556/223 Complete Upper 16in 16HR GI-UR

V Seven Gi Heavy 556/223 Complete Upper 18in 18HR GI-UR

Rainier Arms Ruc Pro Mk2 5.56 Nato Partial Upper Receiver Black 10.5 in

Dark Storm Industries DS-15 AR-15 Stripped Billet Upper Receiver Anodized Black

Rock River Arms 20in Predator HP Upper Post Stainless Steel

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

Bear Creek Arsenal BC-15 5.56 NATO 16in Upper Receiver M4 Barrel Carbine Length 1-8 Twist 1/2x28 Flash Hider Parkerized ODG

Bear Creek Arsenal BC-15 5.56 NATO 16in Bolt Action Style Upper Receiver M4 Barrel 1-8 Twist 1/2x28 Flash Hider Black Nitride Cold Hammer Forged

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

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

ABC RIFLE COMPANY AR-15 7.62x39mm 16in Barrel 15in Lightweight Hybrid M-LOK Handguard Complete Build Upper Receiver 1-10 Twist 5/8x24 A2 Style Muzzle