Shop 4,464 Deals on Upper Receivers

CMMG AR-15 Resolute Mk4 Upper Receiver Assembly 22 Long Rifle 16" Barrel

Aero Precision M4E1 Threaded No Forward Assist Complete Upper Receiver 10.5in 5.56 Carbine RM9.2 Anodized Black

Rock River Arms AR-15 Fred Eichler Series Predator Upper Receiver Assembly 223 Wylde 16" Stainless Steel Barrel 14" Handguard Black

Rock River Arms AR-15 A2 Upper Receiver Assembly 223 Wylde 20" Stainless Steel Barrel 14" Handguard Black

Rock River Arms AR-15 R9 Upper Receiver Assembly 9mm Luger 16"Stainless Steel Barrel 15" M-LOK Handguard Black

CMMG AR-15 Resolute Upper Receiver Assembly 9mm Luger 16" Barrel

CMMG AR-15 Dissent Mk4 Upper Receiver Assembly 300 AAC Blackout 16" Barrel

Blackout Defense Quantum Mark 2 13.9in Mid Complete Upper Black Anodize No Muzzle Device 92268

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

Matador Arms MAT-9K Roller Delayed Bufferless Upper Receiver Assembly 9mm Luger 5" Barrel Gray

Stag Arms AR-10 Marksman Right Hand Upper Receiver 308 Win 18in Barrel HBAR-CMV Profile 1-10 Twist 5/8X24 Thread VG6 Gamma Black

Rock River Arms AR-15 Predator Pursuit Upper Receiver Assembly 223 Wylde 16" Stainless Steel Barrel 12.5" M-LOK Handguard Black

Aero Precision M4E1 Enhanced No Forward Assist Complete Upper Receiver 16in 5.56 Mid EM15 FDE

Aero Precision Complete Upper M4E1-E 5.56 20in Rifle Barrel 1/7 Twist EQ15 Black

Maxim Defense MDX 510 AR-15 Upper Receiver Assembly 7.62x39mm 10.3" Barrel Black

CMMG AR-15 Resolute Upper Receiver Assembly 45 ACP 16" Barrel

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

Rock River Arms AR-15 Predator Pursuit Upper Receiver Assembly 223 Wylde 20" Stainless Steel Barrel 15" M-LOK Handguard Black

Stag Arms AR-15 Barreled Upper Receiver 5.56x45mm NATO 16" Barrel M-Lok Handguard Flat Dark Earth

CMMG AR-15 Dissent Upper Receiver Assembly 45 ACP 16" Barrel

Maxim Defense Industries MDX 505 PDX/SCW Compatible URG Upper Receiver 7.62x39 Hate Brake 5/8-24 Thread 5.5in Barrel Arid Earth

Maxim Defense Industries Maxim PDX Pistol Kit 7.62 X 39 5.5 Barrel

Aero Precision M4E1 Threaded .223 Wylde Complete Upper Receiver 18in 1-8 Twist A2 Flash Hider ATLAS R-ONE Handguard Black Anodized

Matador Arms MAT-9K Roller Delayed Bufferless Upper Receiver Assembly 9mm Luger 5" Barrel Black