Shop 4,464 Deals on Upper Receivers

Aero Precision M4E1 Threaded 5.56mm Complete Upper Receiver 16in Mid Length Pencil Barrel 1-7 Twist A2 Flash Hider ATLAS R-ONE Handguard Black

Grey Ghost Precision AR-15 Complete Upper Receiver 300 AAC Blackout 16" Barrel

Aero Precision M4E1-T Upper 5.56x45mm NATO 16" Government Contour Barrel 15" Mod4 Handguard Kodiak Brown

Troy AR-15 A3S Upper Receiver Assembly 5.56x45mm NATO 16" barrel with 15.125" Gen 2 SOCC Handguard

Kaw Valley Precision Carbon Fiber 9mm Complete Barrel Upper Receiver 4.5in Barrel 7.25in CF Handguard XL Linear Compensator Black Medium

Ar-15 Billet Upper Receiver W/O Forward Assist - Ar-15 Billet Upper Receiver W/O Forward Assist Provisions

Mrp-L M-Lok Shovelhead 5.56mm Assembled Upper Receiver - Mrp-L M-Lok Shovelnose 5.56mm 11.5'''' Assembled Upper Receiver

Del-ton Delton Assembled Ar-15 Upper With M4 Feed Ramps

Aero Precision Complete Upper M4E1-T 5.56 8in Pistol Barrel SM7.3 Anodized Black

Cobalt Kinetics CK-Pro Built Upper Receiver Group 11.5in Barrel 5.56x45mm NATO Black

Sons of Liberty Gun Works East India Starter Kit CHF V2 11.5in 5.56mm Black

Anderson Manufacturing Complete Upper Receiver - Optic Ready Black 6.5 Grendel 16-inch

Aero Precision Complete Upper Receiver M4E1-T .300 AAC Blackout 16in DRP Pistol Length 1 in 7 5/8 x 24 15in A2 Flash Hider Cerakote FDE

Knights Armament SR-25 Complete Upper 6.5 Creedmoor 22 Barrel M-LOK Handguard

Adams Arms P3 12.5" Complete Piston Upper .300 AAC Blackout 1:7, Black - FGAA01366

Aero Precision EPC-9 Threaded Complete Upper Receiver 11in 9mm w/ ATLAS R-ONE 10.3in Handguard FDE

Aero Precision M5E1 Complete Upper Reciever .308 16in Mid Barrel 1-10 Twist 5/8x24 Thread Free-Float Handguard Stainless Steel Cerakote FDE

Brownells Gen 2 Upper Receiver Assembly .223 Wylde 10.5 Barrel

APF AR-10 Assembled Upper 7.62 w/ Charging Handle

Cobalt Kinetics STRIPPD URG 6.75 BLK

Aero Precision M4E1-T Complete Upper Flat Dark Earth 6.5 Grendel 18 Barrel

Luth-AR Bull Rifle Kit Minus Lower Receiver w/ Collapsible Stock .223 29in 20in Bull Rifle 1x9 1/2x28 Picatinny KeyMod A2 Flash Hider Anodized

Battle Arms Development Authority Elite, Complete Upper Receiver, 556NATO, 16 in Barrel, Fits AR-15, M-Lok Handguard, Anodized Finish, Sniper Gray, Includes Bad Rack-15 Ambidextrous Charging Handle and AR15/M16 BCG BAD-AUTH-UR16G-Y-15

Stag Arms Stag 15 Upper Nitride 5.56 7.5 Barrel