Shop 4,464 Deals on Upper Receivers

Aero Precision M4E1 Threaded No Forward Assist Complete Upper Receiver 16in 5.56 Mid RM15 Anodized Black

Grey Ghost Precision GGP Forged Upper Receiver

Aero Precision M5E1 Complete Upper Reciever .308 18in Rifle Barrel 1-10 Twist 5/8x24 Thread Free-Float Handguard Stainless Steel Cerakote FDE

Aero Precision Standard Upper Receiver Assembled AR-15 Aluminum Sniper Gray

Aero Precision M4E1-T Complete Upper .223 Wylde 18in Rifle Length 1/8 15in M-LOK AR15 ATLAS S-ONE A2 Anodize Black

Aero Precision AR-15 Complete Upper Receiver 5.56 Carbine Length 16 inch Barrel w/Pinned FSB Magpul MOE Handguard A2 Flash Hider FDE Cerakote

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 Anodized Kodiak Brown

Aero Precision M5 Complete Upper Receiver 22in 6.5 Creedmoor SS Rifle BRL w/ATLAS R-ONE 15in M-LOK Handguard Anodized Black

AR-STONER AR-15 Pistol Kit 7.5" Barrel 5.56x45mm NATO

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

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

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

Radian Weapons Model 1 Upper and Handguard Set - Upgrade in Black - R0193

Aero Precision M4E1 15in ATLAS S-ONE M-LOK Complete Upper 16in 5.56 HBAR CMV Mid-Length Barrel Anodized Black

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

Aero Precision Complete Upper Receiver M4E1-T 8in .300 Blackout BRL 7in M-LOK ATLAS S-ONE HG Cerakote Flat Dark Earth

Aero Precision M4E1-T Complete Upper Receiver Threaded 5.56x45mm Mid Pencil 16in Barrel ATLAS S-ONE 15in Handguard M-LOK Anodized Black

Aero Precision Complete Upper Receiver M4E1-T .223 16in Wylde Fluted Barrel 15in M-LOK ATLAS S-ONE Handguard Anodized Black

Aero Precision AR-15 M4E1-E Upper Assembly 5.56x45mm NATO 16" HBAR Barrel 15" EM Gen2 Enhanced Handguard Black

Aero Precision AR-15 M4E1-E Upper Assembly 5.56x45mm NATO 10.5" Barrel 9.3" EM Gen2 Enhanced Handguard Flat Dark Earth

Aero Precision M4E1-E Complete Upper 14.5in 5.56 M4 Carbine Barrel EM-12 Handguard Gen 2 Anodized Black

CMMG Mk4 Banshee Upper Receiver Group .300BLK 8in Armor Black

Del-Ton Lightweight Rifle Kit - Sixteen Inch Barrel

Aero Precision M4E1-T Upper 5.56x45mm NATO 14.5" Government Contour Barrel 13.5" Mod4 Handguard Kodiak Brown