Shop 4,481 Deals on Upper Receivers

Radical Firearms Complete Upper Assembly 16in 5.56 SOCOM 1/7 Twist 15in RPR M-LOK Zero Impulse Black

Spikes Tactical Upper 5.56 16in M4 LE w/MOE Grey SL Handguard

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

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

Aero Precision AR15 Stripped Upper Receiver Uncoated

Aero Precision Complete Upper w/ No Forward Assist M4E1-T 5.56 8in 5.56 Pistol Barrel RM7.3 Anodized Black

Aero Precision M4E1-T Complete Upper Receiver 5.56mm 12.5in Carbine Length S-One M-LOK Handguard Black

Guntec USA AR .308 Gen 2 Stripped Billet Upper Receiver Rainbow

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

WMD Guns Upper Assembly Billet AR-15 MLOK HG 12in NiB-X Nickel

Aero Precision Complete Upper Receiver M4E1-T .223 18in Wylde Barrel 15in M-LOK ATLAS S-ONE Handguard Flat Dark Earth

Aero Precision Complete Upper M4E1-E 5.56 20in Rifle Barrel 1/7 Twist EQ15 FDE

Aero Precision Complete Upper Receiver M4E1-T .223 18in Wylde Fluted Barrel 15in M-LOK ATLAS S-ONE Handguard Cerakote Flat Dark Earth

USED Guntec USA AR-15 Stripped Billet Upper Receiver MIL-A-8625 Type III Anodized Black GT-UPPER

Guntec USA AR .308 Stripped Billet Upper Receiver Gen 2 Flat Dark Earth

Aero Precision M4E1-T Complete Upper .223 Wylde 16in Mid Length 1/8 15in M-LOK AR15 ATLAS S-ONE A2 FDE

Aero Precision M4E1 Complete Upper Receiver AR-15 18 in Rifle Length Barrel 15 in Quad Rail Handguard No BCH/CH Anodized Black

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

Luth-AR A3 Complete Upper Receiver Assembled 16in Lightweight Barrel 5.56mm 1-7 Twist 1/2 x 28 Thread A2 Flash Hider w/ Key MOD Palm Handguard Black

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

CMMG Mk4 .300BLK Resolute Upper Group Receiver 16.1in Charcoal Green

Spikes Tactical Upper 5.56 11.5in FN CHF w/7in BAR2 Rail & FSP

Spikes Tactical Upper 5.56 16in Midlength LE w/10in M-LOK Rail

Guntec USA AR .308 Gen 2 Stripped Billet Upper Receiver Blue