Shop 4,483 Deals on Upper Receivers

Aero Precision SM10.3 M4E1-T Complete Upper w/11.5in 5.56 Barrel FDE

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

Stag Arms AR-15 Covenant Left Hand Upper Receiver 6mm 18in Barrel BULL Profile 1-7 Twist 5/8-24 Thread VG6 Gamma Black

WMD Guns Upper Assembly Billet AR-15 MLOK HG 15in NiB-X Nickel

Ammunition Storage Components AR-15 Billet Slick Side Upper Receiver 15in Free Float MLOK Handguard Combo Black

Stag Arms AR-15 Tactical Upper Receiver .300 AAC Blackout 8in Barrel GOV-CMV Profile 1-7 Twist 1/2x28 Left Hand VG6 Delta Black

Stag Arms AR-15 Tactical Right Hand Upper Receiver .300 AAC Blackout 8in Barrel GOV-CMV Profile 1-7 Twist 1/2 x 28 Thread VG6 Delta Black

Guntec USA AR-15 Stripped Billet Upper Receiver Raw Unfinished

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 OD Green

Aero Precision Complete Upper Receiver M4E1 16in 5.56 Mid Pencil Barrel EM-15 HG Gen 2 FDE Cerakote

Maxim Defense Industries MDX 508 U.R.G. AR-15 7.62x39mm 8.5 inch Upper Receiver Pistol Length 1-10 Twist 5/8x24 HATEBRAKE Arid

DEMO Daniel Defense Upper Receiver w/Flash Hider Assembly DD4 RIIIS URG 5.56x45 20.5in 11.5in BRRL Gov Profile Carbine 1-7 1/2x28 MLOK Flash

WMD Guns AR-15 A3/A4 Upper Receiver Forged w/M4 Feed Ramps NiB-X Zombie Green 1-NIBXURF-Zombie Green

Grid Defense Complete Upper Receiver 5.56mm 10.5 inch Carbine Length 4150 Steel M4 Barrel 1-7 Twist A2 Flash Hider Tactical Grape

FM Products Glock Style 9mm 5 inch AR Rear Charging Builders Kits Black

Stag Arms AR-15 Tactical Right Hand Upper Receiver 5.56 NATO 16in Barrel Hanson Profile 1-7 Twist 1/2 x 28 Thread VG6 Gamma Black

Spikes Tactical Upper 5.56 16in M4 LE w/13.2in BAR2 Rail

Aero Precision Complete Upper Receiver M4E1 .223 Wylde Mid Barrel EQ-15 HG No BCG/Charging Handle Gen 2 Anodized Black 16in APAR600251Q9

Aero Precision Complete Upper Receiver M4E1 16in 5.56 Mid Pencil Length Barrel EQ-15 Gen 2 Handguard Anodized Black

Aero Precision Complete Upper Receiver M4E1 .300 Blackout Barrel EQ-15 HG No BCG/Charging Handle Gen 2 Anodized Black 16in APAR600251Q14

Aero Precision M4E1 Complete Upper Receiver AR-15 5.56x45mm NATO 16 in Mid Length Barrel 12 in Quad Rail Handguard No BCG/CH Anodized Black

Aero Precision Complete Upper Receiver M4E1 .223 Wylde Mid Barrel EM-12 HG No BCG/Charging Handle Gen 2 Anodized Black 16in APAR600231M9

Aero Precision M4E1 Complete Upper Receiver 16in 5.56 M4 Carbine Barrel EM-12 HG Gen 2 Anodized Black

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