Shop 4,464 Deals on Upper Receivers

Blackout Defense Complete Dual Taper Lock .223 Wylde Upper Receiver Group Slick Side 16in Mid FDE

Blackout Defense Complete Dual Taper Lock .223 Wylde Upper Receiver Group Forward Assist 11.5in Carbine FDE

Icon Defense Forged Stripped Upper Receiver Type 3 Hard Coat Anodize Finish Black

Aero Precision M5E1 Complete Upper Reciever 6.5 CM 24in Rifle Barrel 1-8 Twist 5/8x24 Thread Free-Float Handguard Stainless Steel Cerakote FDE

JARD AR Left Side Charge Upper Reciever Complete w/ Bolt Black

New Frontier Armory New Frontier C10 Upper Recvr Ar10 Stripped Billet Black

Spikes Tactical Upper 5.56 16in Midlength LE w/BLK MOE Handguard & FSP

Blackout Defense Complete Dual Taper Lock .223 Wylde Upper Receiver Group Forward Assis 16in Mid FDE

Aero Precision M4E1-T Upper 5.56x45mm NATO 13.9" Government Contour Barrel 12.7" Mod4 Handguard Black

Rock River Arms AR-15 X-1 Upper Receiver Assembly 223 Wylde 18" Stainless Steel Barrel 17" M-LOK Handguard Black

CMMG AR-15 Dissent Mk4 Upper Receiver Assembly 350 Legend 16" Barrel

NBS AR-9 Billet Upper Receiver for 9mm / .45

Ke-15 Upper Reciever W/ Forward Assist & Dust Cover - Ke-15 Upper Reciever W/ Forward Assist & Dust Cover 5.56mm

Aero Precision M4E1 Threaded Assembled Upper Receiver + BREACH Charging Handle & 5.56 Black Nitride BCG

Cross Machine Tool Ultra Precision Stripped AR-15 Billet Upper Receiver

Ghost Firearms Vital Complete Upper Receiver .300 Blackout 16in Pistol Length 4150 Light HBAR Barrel 1-8 Twist 11in M-LOK Free Float Hand Guard A2

CMMG LR-308 Dissent Mk3 Upper Receiver Assembly 308 Winchester 16" Barrel

Blackout Defense Quantum Mark 2 16.0in Mid Complete Upper Black Anodize No Muzzle Device 92271

Del-Ton Pre-Ban M4 Profile Flat Top Barrel Assembly 14.5in

Aero Precision M4E1 Mid Barrel Complete Upper Receiver w/Flash Hider AR-15 5.56x45mm NATO 16in Mid Length Barrel 15in Quad Rail Handguard No BCG/CH

CMMG Mk10 Banshee Upper Receiver Group 10mm 8in Armor Black

Q Sugar Weasel 5.56x45mm NATO 16 inch Upper Receiver Blk

M16A1 Stripped Upper Receiver - M4 Feedramps

Dirty Bird AR-15 Stripped Upper Receiver-Blem - Midnight Bronze