Shop 4,464 Deals on Upper Receivers

Rock River Arms AR-15 A4 Upper Receiver Assembly 223 Remington (Wylde) 20" Chrome Moly Barrel 14" Handguard Black

Radical Firearms Complete Upper Assembly 16in 6.8 SPC II HBAR Contour 1/11 Twist 12in MHR M-LOK A2 Flash Hider Black

Aero Precision M4E1 Complete Upper .223 Wylde 18in Rifle Length 1/8 EM-15 Gen2 A2 FDE

Stag Arms AR-15 Barreled Upper Receiver 6mm ARC 20" Barrel Left Hand

Maxim Defense MDX 510 AR-15 Upper Receiver Assembly 5.56x45mm 10.3" Barrel Arid

Maxim Defense MDX 508 AR-15 Upper Receiver Assembly 7.62x39mm 8.5" Barrel Black

Maxim Defense MDX 508 AR-15 Upper Receiver Assembly 300 AAC Blackout 8.5" Barrel Black

Maxim Defense Industries PDX Kit Flat Dark Earth 5.56 5.5 Barrel 20-Rounds Threaded

Aero Precision M4E1 Threaded No Forward Assist Complete Upper Receiver 10.5in 5.56 Carbine SM9.2 FDE

Spikes Tactical Upper 5.56 16in Midlength LE w/ML Handguard and FSP Black

Aero Precision M4E1-T Complete Upper .223 Wylde 18in Rifle Length 1/8 15in M-LOK AR15 ATLAS S-ONE A2 FDE

Aero Precision Complete Upper Receiver M5E1 20in 6.5 CM SS Rifle Barrel EM-15 HG Gen 2 FDE

Luth-AR Lo Drag Upper Receiver AR-15 Black

Aero Precision Complete Upper Receiver M4E1-T .300 16in Blackout Barrel 15in M-LOK ATLAS S-ONE Handguard Cerakote Flat Dark Earth

Maxim Defense Industries PDX Kit .300 AAC Blackout 5.5 Barrel Upper and Brace

Stag Arms AR-15 Barreled Upper Receiver 5.56x45mm NATO 16" Barrel M-Lok Handguard Black

Aero Precision AR-15 M4E1-T Upper Receiver Assembly 5.56x45mm NATO 16" Barrel Mid-Length OD Green Cerakote

Radical Firearms Complete Upper Assembly 16in 6.8 SPC II HBAR Contour 1/11 Twist 15in RPR M-LOK A2 Flash Hider Black

Tacfire AR-15 5.56/.233/.300AAC Stripped Upper Receiver w/M4 Feed Ramps Black

SEEKINS IRMT-R BILLET UPPER BLK

Stag Arms 3 Gun AR-15 Barreled Upper Receiver 5.56x45mm NATO 18" Barrel Left Hand

VLTOR MUR Pistol Caliber Upper Receiver With Gas Deflector

WMD Guns Complete Upper Assembly 300 Blackout Match-Grade 16" Barrel NiB-X Finish Nickel 15" M-LOK Hand guard Muzzle Compensator

ZRODelta 12in Forged Upper Receiver Group Assembly AR15 7075-T6 Black Anodize .223 Wylde 16in BBL Govt MLG Nitride 12in Handguard MLOK A2 Flash Hider