Shop 4,464 Deals on Upper Receivers

Geissele AR-15 Super Duty MOD1 Upper Receiver Assembly 5.56x45mm 16" Hbar Barrel M-LOK Black

Aero Precision M4E1-T RM10.3 Complete Upper 5.56 x 45 12.5inch Government Carbine 1-7 Twist 1/2 x 28 Thread Cerakote FDE

Aero Precision M5 Complete Upper Receiver 18in .308 SS Rifle Barrel w/ATLAS R-ONE 15in M-LOK Handguard Anodized Black

Geissele AR-15 Super Duty MOD1 Upper Receiver Assembly 300 AAC Blackout 8" Cold Hammer Forged Barrel M-LOK DDC

Faxon AR-15 Upper Receiver Assembly 338 ARC 16" Barrel

Aero Precision AR-15 M4E1-E Upper Assembly 5.56x45mm NATO 16" Barrel 15" EM Gen2 Enhanced Handguard Flat Dark Earth

Radical Firearms RF Upper Assembly 16in 5.56 SOCOM 1/7 Twist 12in RPR M-LOK A2 Flash Hider Black

Sons of Liberty Gun Works AR-15 M4 Patrol SL Upper Receiver Assembly 5.56x45mm 11.5" Barrel

Matador Arms Upper Receiver Montgo 9mm 12.125in 5.5in 1/2x28in Thread Black

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

Aero Precision M4E1-T Upper 5.56x45mm NATO 12.5" Government Contour Barrel 11.4" Mod4 Handguard Kodiak Brown

SEEKINS SP10M CMPLT UPPR 308 22 FDE

Mean Arms Bearing Delay AR-15 9mm 7.5in Upper Receiver Assembly 1/2x28 Black

M16A1 Assembled Upper Receiver w/o M4 Feedramps

Kaw Valley Precision M-Lok 9mm Complete Upper Receiver 16mm M-LOK Handguard Black Medium

Anderson Manufacturing AR15A3UPFORUMTCOM A3 Upper NO BBL

Savage Arms MSR15 Competition Upper Receiver .223 Wylde 18 Barrel Black 0C784900 BV

Radical Firearms RF Upper Assembly 16in 5.56 SOCOM 1/7 Twist 15in RPR M-LOK A2 Flash Hider Black

Stag Arms Stag 15 M4 Upper 5.56 16 Barrel

HERA Arms HCU AR Upper Reciever Commercial Black

Guntec USA AR-15 Stripped Billet Upper Receiver Tungsten

Radical Firearms RF Upper Assembly 10.5in 300 AAC HBAR Contour 1/8 Twist 10in RPR M-LOK A2 Flash Hider Black

AR-STONER AR-15 Pistol Upper Receiver Assembly 300 Blackout 8" Barrel

Radical Firearms Complete Upper Assembly 8.5in 300 AAC HBAR Contour 1/7 Twist 7in RPR M-LOK A2 Flash Hider Black