Shop 4,464 Deals on Upper Receivers

Aero Precision Complete Upper Receiver M4E1-T 5.56 16in M4 Barrel 15in M-LOK ATLAS S-ONE Handguard Cerakote Flat Dark Earth

Stern Defense AR-15 SD 4 MOD4 Upper Receiver Assembly 40 S&W 4" M-LOK

Aero Precision M4E1-T Upper 5.56x45mm NATO 11.5" Government Contour Barrel 10.6" Mod4 Handguard Olive Drab Green

Aero Precision M4E1 Threaded .223 Wylde Complete Upper Receiver 18in 1-8 Twist A2 Flash Hider 15 in M-LOK ATLAS R-ONE Handguard FDE Cerakote

Aero Precision Complete Upper Receiver M4E1 .300 Blackout Barrel EM-15 HG No BCG/Charging Handle Gen 2 FDE Cerakote 16in APAR600252M14

Aero Precision M4E1-T Upper 5.56x45mm NATO 11.5" Government Contour Barrel 10.6" Mod4 Handguard Black

Aero Precision SM10.3 M4E1-T Complete Upper w/11.5in 5.56 Barrel Black

Aero Precision Complete Upper Receiver M4E1-T 20in 5.56 Rifle Length Barrel 15in M-LOK ATLAS S-ONE Handguard Cerakote Flat Dark Earth

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

Aero Precision M4E1 Complete Upper Receiver 16in 5.56 M4 Carbine Barrel EM-15 HG Gen 2 FDE Cerakote

Aero Precision LR-308 M5E1 Upper Assembly 308 Winchester 18" Barrel 16.6" EM Gen2 Enhanced Handguard Flat Dark Earth

Aero Precision M4E1 Threaded 5.56mm Complete Upper Receiver 16in M4 Barrel 1-7 Twist A2 Flash Hider ATLAS R-ONE Handguard FDE Cerakote

Aero Precision Complete Upper Receiver M4E1-T .223 18in Wylde Fluted Barrel 15in M-LOK ATLAS S-ONE Handguard Anodized Black

AR-STONER AR-15 Pistol Upper Receiver Assembly 5.56x45mm NATO 10.3" Barrel Carbine Length M-LOK Handguard

Aero Precision M4E1 Standard Upper Receiver Assembled AR-15 No Forward Assist Flat Dark Earth

Aero Precision M4E1 Standard Assembled AR-15 Upper Receiver No Forward Assist Aluminum Black

Aero Precision AR15 Complete Upper 16in 5.56 M4 Carbine Barrel w/ Pinned FSB M4 Handguard Includes BCG & CH Anodized Black

Aero Precision Complete Upper Receiver M5 .308 Winchester 20in Heavy Rifle Length 1 in 10 5/8 x 24 15in A2 Flash Hider Anodized Kodiak Brown

Aero Precision M5 Complete Upper Receiver 18in .308 Rifle Barrel w/ATLAS S-ONE 15in M-LOK Handguard Anodized Flat Dark Earth

Geissele AR-15 Super Duty MOD1 Upper Receiver Assembly 5.56x45mm 14.5" Pinned and Welded HBAR Barrel M-LOK Desert Dirt

Geissele AR-15 Super Duty MOD1 Upper Receiver Assembly 5.56x45mm 14.5" Pinned and Welded Heavy Barrel M-LOK Desert Dirt

Aero Precision Complete Upper Receiver M4E1-T 5.56x45mm NATO 11.5in Government Carbine Length 1 in 7 1/2 x 28 10.3in A2 Flash Hider Anodized OD Green

Aero Precision M5 Complete Upper Receiver 16in .308 CMV Mid Barrel w/ATLAS S-ONE 15in M-LOK Handguard Anodized Black

Aero Precision M4E1 Threaded .223 Wylde Complete Upper Receiver 16in Mid-Length Barrel 1-8 Twist A2 Flash Hider ATLAS R-ONE Handguard Black Anodized