Shop 4,464 Deals on Upper Receivers

Rock River Arms AR-15 A4 Upper Receiver Assembly 223 Remington (Wylde) 16" Chrome Moly Barrel M-LOK Handguard Black

Rock River Arms AR-15 A4 Upper Receiver Assembly 9MM Luger 7" Chrome Moly Barrel 6" M-LOK Handguard Black

Rock River Arms LR-308 A4 Upper Receiver Assembly 308 Winchester, 7.62x51mm NATO 16" Chrome Moly Barrel 11" M-LOK Handguard Black

Daniel Defense V9 Upper Group Black 5.56 / .223 Rem 16-inch

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

Rock River Arms AR-15 Varmint A4 Upper Receiver Assembly 223 Wylde 24" Stainless Steel Barrel 20" Handguard Black

Rock River Arms AR-15 Upper Receiver Assembly 5.56x45mm 10.5" Barrel

LaRue Tactical Match Grade AR-15 Complete Upper Receiver 6.5 Grendel 18" Barrel

Aero Precision AR-15 M4E1 Upper Receiver Assembly 5.56x45mm NATO 16" Barrel Atlas S-One M-LOK Handguard without Bolt Carrier Group or Charging Handle Olive Drab

Aero Precision M4E1 Threaded .223 Wylde Complete Upper Receiver 16in SS QPQ Mid-Length Barrel 1-8 Twist A2 Flash Hider 15in M-LOK ATLAS R-ONE

CMMG LR-308 Dissent Mk3 Upper Receiver Assembly 6.5 Creedmoor 20" Barrel

Maxim Defense Industries PDX Kit 5.56 5.5 Barrel Upper and Brace

Rock River Arms AR-15 Varmint A4 Upper Receiver Assembly 223 Wylde 18" Stainless Steel Barrel 13" M-LOK Handguard Black

Rock River Arms AR-15 A4 Upper Receiver Assembly 9mm Luger 10.5" Chrome Moly Barrel 6" Handguard Black

Aero Precision M5E1 Complete Upper 22in 6.5 CM SS Rifle Barrel EM-15 HG Gen 2 FDE

Spikes Tactical Upper 5.56 16in M4 LE w/12in M-LOK Rail

AR-STONER AR-15 Upper Receiver Assembly 300 AAC Blackout 16" Barrel Pistol Length M-LOK Handguard

Maxim Defense Industries PDX Pistol Kit (Upper and Brace Only) Flat Dark Earth .300 AAC Blackout 5.5 Barrel

WMD Guns AR-15 A3/A4 Upper Receiver Forged w/M4 Feed Ramps Stripped NiB-X Nickel

Aero Precision M4E1 Complete Upper .223 Wylde 16in Mid Length 1/8 EM-15 Gen2 A2 FDE

Aero Precision M4E1 5.56 NATO No Forward Assist Threaded Assembled Upper Receiver OD Green

Aero Precision M4E1 5.56 NATO No Forward Assist Threaded Assembled Upper Receiver Kodiak Brown

Aero Precision M4E1-T SM10.3 5 Complete Upper 5.56 x 45 12.5inch Government Carbine 1-7 Twist 1/2 x 28 Thread Cerakote FDE

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