Shop 4,464 Deals on Upper Receivers

AR-STONER AR-15 Rifle Kit 16" Barrel 45 ACP

Aero Precision Complete Upper Receiver w/Flash Hider M4E1 .300 Barrel EQ-9 HG No BCG/Charging Handle Gen 2 Anodized Black 10in APAR600221Q4

AR-STONER AR-15 Upper Receiver Assembly 5.56x45mm NATO 16" Barrel Mid Length 15" M-LOK Handguard

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 Anodized Black

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

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

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

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 Olive Drab

Aero Precision M5 Complete Upper Receiver 24in 6.5 Creedmoor SS Rifle Barrel w/ATLAS R-ONE 15in M-LOK Handguard Anodized Flat Dark Earth

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

LaRue Tactical Match Grade AR-15 Complete Upper Receiver 5.56x45 NATO 16.1" Barrel

Aero Precision M5E1 Complete Upper Reciever .308 20in Rifle Barrel 1-10 Twist 5/8x24 Thread Free-Float Handguard Stainless Steel anodized Black

Aero Precision AR-15 M4E1-E Upper Assembly 223 Wylde 18" Barrel 15" EM Gen2 Enhanced Handguard Black

Aero Precision M5 Complete Upper Receiver 18in 6.5 Creedmoor SS Mid-Length Barrel w/ATLAS S-ONE 15in M-LOK Handguard Anodized Black

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

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

Aero Precision M5 Complete Upper Receiver 20in .308 Rifle Barrel w/ATLAS R-ONE 15in M-LOK Handguard Anodized Flat Dark Earth

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

Ghost Firearms Elite Complete Upper Receiver 7.62x39 16 inch Carbine Length 4150 Light HBAR Barrel 1-10 Twist 14 inch M-LOK Free Float Hand Guard A2

Rock River Arms AR-15 Complete Upper Receiver 5.56x45mm NATO 16" Barrel with Gas Block

Stern Defense SD 8.5in MOD5 .40SW Upper Receiver Assembly 10in M-LOK Handguard .578-28 TPI 1-16 Twist Rate Black 015SD10INMD5ML8.5INBR40SWKK

Ballistic Advantage Logic Series Barrel 5.56x45 11.3 inch Hanson Carbine 1-7 Twist 1/2 x 28 Thread Anodized Black

Ballistic Advantage Premium Black Series Barrel .308 Win 18 inch Hanson Midlength 1-10 Twist 5/8 x 24 Thread Anodized Black

Blackout Defense Complete Dual Taper Lock .223 Wylde Upper Receiver Group Forward Assist 13.9in Mid Green