Shop 4,464 Deals on Upper Receivers

Aero Precision Complete Upper Receiver M4E1-T 5.56x45mm NATO 13.9in Government Mid Length 1 in 7 1/2 x 28 12.7in S-ONE M-LOK HG A2 Flash Hider

Del-Ton Pre-Ban M4 Carbine Rifle Kit w/OD Green MLOK Furniture 5.56x45mm NATO 16 in 1-9 Twist Matte Black

Radical Firearms AR-15 RF Upper Assembly 16in 7.62x39 4150V HBAR Contour 1/10 Twist 12in RPR M-LOK A2 Flash Hider Black

Rock River Arms AR-15 Upper Receiver Assembly 223 Wylde 18" Barrel 17" M-LOK Handguard

CMMG Banshee 200 Upper 5.7 X 28 8 Barrel 40-Rounds

Aero Precision M4E1-T PRO CHF M4 5.56mm 16 inch Complete Upper Receiver Hanson Mid Length 1-7 Twist A2 Birdcage Anodized OD Green

Troy AR-15 A3 Upper Receiver Assembly 223 Wylde 14.5in Barrel w/ 12.5in SOCC-Series Handguard Black Mid-Length

Dirty Bird AR-15 Stripped Upper Receiver-Blem - OD Green

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

Aero Precision AR-15 Assembled Upper Receiver

NBS AR-15 Stripped Upper

Radical Firearms Complete Upper Assembly 16in 223 Wylde 416R HBAR Contour 1/8 Twist 12in MHR M-LOK A2 Flash Hider Black

Matador Arms MAT-916 Roller Delayed Bufferless Upper Receiver Assembly 9mm Luger 16" Barrel Black

Radical Firearms RF Upper Assembly 16in 223 Wylde 416R HBAR Contour 1/8 Twist 12in MHR M-LOK A2 Flash Hider Black

Radical Firearms AR-15 Complete Upper Assembly 16in 7.62x39 4150V HBAR Contour 1/10 Twist 15in MHR M-LOK A2 Flash Hider Black

Radical Firearms Complete Upper Assembly 10.5in 7.62x39 4150V HBAR Contour 1/10 Twist 9in MHR M-LOK A2 Flash Hider Black

Radical Firearms RF Upper Assembly 16in 300 AAC HBAR Contour 1/8 Twist 12in RPR M-LOK A2 Flash Hider Black

Stag Arms AR-15 Covenant Right Hand Upper Receiver 6mm 18in Barrel BULL Profile 1-7 Twist 5/8-24 Thread VG6 Gamma Black

Rainier Arms Rellim Arms AR-15 Take Down Upper Receiver Assembly Combo Black

New Frontier AR-15 G-4 Slick Side Billet Upper Receiver

Charles Daly 500219 AR 410 Upper 410 Gauge 2.5 in(Only) 19 in Aluminum Barrel w/Black Anodized Finish, Flip Up Front & Rear Sights w/Quad Picatinny Rail, Auto Ejection, Includes 1 5rd, Magazine

Colt 223 Rem/ 556 NATO M4 Feed Ramps Upper Black

Aero Precision M5 Complete Upper Receiver 22in 6.5 Creedmoor SS Rifle Barrel w/ATLAS S-ONE 15in M-LOK Handguard Anodized Flat Dark Earth

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