Shop 4,476 Deals on Upper Receivers

CMMG Resolute 16.10" Upper .300 AAC Blackout with 1:7 Twist Rate and M-LOK Rail - Carbine-Length with BCG and CH - Armor Black - 30B12BBAB

Bowden Tactical AR Rifle Builder Kit - Comprehensive Builder Kit for Customized AR Rifle - J27115

Phoenix HP22/HP22A 5" Barrel .22 LR Conversion Kit, Blued - HP22BBLB

Tacfire Build Kit w/ 20" Anodized Black Barrel for AR-10 308 Winchester Rifle - SSRK308LPK20BN

Tacfire .45 ACP 7.5" KeyMod Unassembeld Pistol Build Kit, Black - SSPK45ACPLPKK

Tacfire 9mm 7.5" KeyMod Unassembeld Pistol Build Kit, Black - SSPK9MMLPK7K

Sons of Liberty Gun Works Swampfox 16" Upper 5.56x45mm/.223 Remington, Black

Panzer AR57 16" ULT Upper Assembly 5.7x28mm w/ 50 rd Mag - ULT 0116

Faxon 338 ARC AR-15 Upper Receiver with Completion Kit

Colt Upper 223/556NATO 11.5 Inch Lightweight Barrel w/Integrated Rail

Colt Firearms LE6920CK-NHG Upper Kit Black 5.56NATO/.223Rem 16-inch

Aero Precision M4E1 Enhanced Assembled Upper Kodiak Brown 5.56

Aero Precision Assembled Upper Receiver Kodiak Brown 5.56

Aero Precision M4E1 Assembled Upper Receiver 5.56

Aero Precision M4E1-T Upper 6.5 Grendel 20 Barrel

Geissele Automatics Super Duty Stripped Upper 5.56 16 Barrel

Geissele Automatics Super Duty Stripped Upper - DDC Desert Dirt 5.56 10.3 Barrel

Geissele Automatics Super Duty Stripped Upper Flat Dark Earth 5.56 16 Barrel

Aero Precision Assembled Upper Receiver No Forward Assist

Aero Precision M4E1 5.56mm M4 Carbine 16 Barrel Complete Upper Receiver

Aero Precision M4E1 Complete Upper .223 Wylde 18 Rifle Barrel

Aero Precision Stripped Upper Receiver No Forward Assist

Aero Precision Threaded Upper Receiver M4E1 5.56 11.5 inch Barrel 9 inch M-LOK ATLAS S-ONE Handguard A2 Flash Hider Anodized Black

Primary Weapons Systems MK116 .223 Wylde Upper with 16.1" Barrel, Black - 182M116UA0B