Shop 4,481 Deals on Upper Receivers

Maxim Defense Industries MDX 510 U.R.G. AR-15 .300 AAC Blackout 10.3 inch Upper Receiver Pistol Length 1-8 Twist 5/8x24 HATEBRAKE Urban

Maxim Defense Industries MDX 505 PDX/SCW Compatible URG Upper Receiver 300 BLK NATO Hate Brake 5/8-24 Thread 5.5in Barrel Arid Earth

WMD Guns AR-15 A3/A4 Upper Receiver Forged w/M4 Feed Ramps NiB-X Black

WMD Guns AR-15 A3/A4 Upper Receiver Forged w/M4 Feed Ramps Stripped NiB-X Titanium Blue 1-NIBXUF-Titanium Blue

WMD Guns AR-15 A3/A4 Upper Receiver Forged w/M4 Feed Ramps Stripped NiB-X Corvette Yellow 1-NIBXUF-Corvette Yellow

Ghost Firearms Elite Complete Upper Receiver 7.62x39 10.5 inch Carbine Length 4150 M4 Barrel 1-10 Twist 9 inch M-LOK Free Float Hand Guard A2 Flash

Grid Defense Complete Upper Receiver 5.56mm 7.5 inch Pistol Length 4150 M4 Barrel 1-7 Twist 9 inch Octagon M-LOK Rail Dimpled Flash Can Black

Grid Defense Complete Upper Receiver 5.56mm 7.5 inch Pistol Length 4150 M4 Barrel 1-7 Twist 9 inch Octagon M-LOK Rail Dimpled Flash Can Burnt Bronze

Aero Precision Complete Upper Receiver M4E1 16in 5.56 Mid Pencil Barrel EM-12 HG Gen 2 FDE Cerakote

Aero Precision Complete Upper Receiver M4E1 16in 5.56 Mid Pencil Barrel EQ-12 HG Gen 2 Anodized Black

Aero Precision M4E1 Mid Barrel Complete Upper Receiver w/Flash Hider AR-15 5.56x45mm NATO 16in Mid Length Barrel 12in M-LOK Handguard No BCG/CH

Aero Precision M4E1-T Complete Upper Receiver .300 AAC Blackout 8in Pistol Length R-One M-LOK Handguard Black

Aero Precision M4E1-T Complete Upper Receiver 5.56mm 11.5in Carbine Length S-One M-LOK Handguard Black

Aero Precision Complete Upper M4E1-E .223 Wylde 16in Mid-Length EQ15 Anodized Black

Aero Precision M4E1 Threaded .223 Wylde Complete Upper Receiver 16in Mid-Length Barrel 1-8 Twist A2 Flash Hider ATLAS R-ONE Handguard FDE Cerakote

DEMO Aero Precision AR-15 Complete Upper Receiver 5.56 Mid-Length 16 inch Barrel w/Pinned FSB Magpul MOE SL Handguard A2 Flash Hider FDE Cerakote

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

CMMG Dissent Mk3 .308 Winchester 20 inch Upper Receiver 1-10 Twist 5/8 x 24 CMMG ZEROED Muzzle Brake Cerakote/Hard Coat Anodized

CMMG Mk4 .300BLK Banshee Upper Group Receiver 8in 1-7 Twist 5/8 X 24 TPI 16.5in Tungsten

Spikes Tactical Upper 5.56 11.5in FN CHF w/FDE MOE Handguards & FSP

WMD Guns AR-15 A3/A4 Upper Receiver Forged w/M4 Feed Ramps Stripped NiB-X White

WMD Guns AR-15 A3/A4 Upper Receiver Forged w/M4 Feed Ramps Stripped NiB-X Prison Pink 1-NIBXUF-Prison Pink

WMD Guns Upper Assembly Billet AR-15 .224 MLOK HG 15in 18in Barrel NiB-X Nickel

V Seven Enlightened 7075 Aluminum AR15 Upper ENLI UR-ALU