Shop 4,464 Deals on Upper Receivers

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

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

Ghost Firearms Elite Complete Upper Receiver 5.56x45 NATO 16in Carbine Length 4150 M4 Barrel 1-7 Twist 14in M-LOK Free Float Hand Guard A2 Birdcage

Ghost Firearms Elite Complete Upper Receiver 5.56x45 NATO 10.5 inch Carbine Length 4150 M4 Barrel 1-7 Twist 9 inch M-LOK Free Float Hand Guard A2

Ghost Firearms Elite Complete Upper Receiver 5.56x45 NATO 10.5 inch Carbine Length 4150 M4 Barrel 1-7 Twist 9 inch M-LOK Free Float Hand Guard A2

CMMG DISSENT Mk4 5.56x45mm NATO 10.5in Upper Receiver 1-7 Twist .750in 1/2 X 28 TPI Tungsten

CMMG MkG .45 ACP Resolute Upper Group Receiver 16.1in Charcoal Green

Spikes Tactical Upper 5.56 14.5in 16in OAL Midlength Lightweight LE w/13.2in SAR3 Rail w/ Vortex FH

POF USA Revolution DI Complete Upper Black Andodized 308WIN 16.5"

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

Stag Arms AR-10 Marksman Left Hand Upper Receiver 308 Win 18in Barrel HBAR-CMV Profile 1-10 Twist 5/8X24 Thread VG6 Gamma FDE

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

ABC RIFLE COMPANY AR-15 .300 AAC Blackout Micro Pistol Build 5in Barrel 4in M-LOK Handguard Upper Receiver Red

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

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

ABC RIFLE COMPANY AR-15 7.62x39mm M-LOK Handguard Complete Pistol Upper Receiver w/BCG And Charging Handle 1-10 Twist 5/8x24 A2 Style Muzzle Brake

Luth-AR Complete Upper Receiver Assembly .223 29in 20in Bull Rifle 1x9 1/2x28 Picatinny Key MOD A2 Flash Hider Anodized Manganese Phosphate Silver/

CMMG Dissent Mk4 6.5mm Grendel 16.1in Upper Group 1-8 Twist .750in 25.5in 5/8 X 24 TPI Sniper Grey

CMMG Dissent Mk4 6.5mm Grendel 16.1in Upper Group 1-8 Twist .750in 25.5in 5/8 X 24 TPI Armor Black

Dark Storm Industries DS-15 Complete Upper 16" Typhoon 5.56 Threaded Black 5.56

Dark Storm Industries DS-15 Stripped Upper Receiver 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 Flat Dark Earth

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 Black

FM Products FM-45 AR Upper Receiver w/ Micro Brake .45 Caliber 10 inch 10in Barrel Ultralight ProfileFlash Supressor Black