Shop 4,464 Deals on Upper Receivers

Moriarti AR-15 5.56/.223 Stainless Steel Diamond Fluted Tactical Upper Assembly Black 20in

OP Exclusive Moriarti AR-15 Upper Receiver 300 Blackout 10.5in Pistol Medium M-LOK 1-7 Twist 5/8x24 Thread Diamond Cut Free-Float Handguard Triport

Black Rain Ordnance Builder's Kit AR-15 5.56mm 16 in Upper Receiver Flat Dark Earth

Primary Weapons Systems MK107 MOD 1-M Upper Rceiver 7.62x39 7.75in 1-10 Twist 3-Setting Adjustable Gas System Black

Guntec USA AR-15 Stripped Billet Upper Receiver w/15in Ultralight Series M-Lok Handguard Anodized Red

USED Radical Firearms AR-15 Complete Upper Assembly 16in 7.62x39 4150V HBAR Contour 1/10 Twist 15in FCR M-LOK Black EDEMO2

USED FM Products Glock Style 9mm 16 inch AR Rear Charging Builders Kits Black FM9-16-RS-BLDR EDEMO1 Used Condition Fair Scratches

FM Products FM-45 AR Rear Charging Upper Receiver w/ Micro Brake .45 Caliber Ultralight Profile Black

DEMO AR57 ULT Upper Receiver Assembly 5.7x28mm 18in 16in Barrel 1/2x28 Thread AR57-ULT16

DEMO Aero Precision Complete Upper Receiver M4E1 .300 Barrel EM-9 HG No BCG/Charging Handle Gen 2 Anodized Black 10in APAR600221M4

TRYBE Defense AR-15 Magnite Go Fast Ultra Lightweight Stripped Upper Receiver Black AR15MGFSU-BK

ABC RIFLE COMPANY AR-15 .300 AAC Blackout Micro Pistol 5in Barrel M-LOK Handguard Upper Receiver w/BCG And Charging Handle Black

ABC RIFLE COMPANY AR-15 .300 AAC Blackout Pistol M-LOK Handguard Complete Upper Receiver w/BCG And Charging Handle Olive Drab Green

ABC RIFLE COMPANY AR9 9mm Luger Rifle Billet 16in Barrel M-LOK Handguard Complete Upper Receiver w/BCG And Charging Handle Cerakote Olive Drab Green

ABC RIFLE COMPANY AR-15 .223 Remington/5.56x45mm NATO Micro Pistol 5in Barrel M-LOK Handguard Upper Receiver w/BCG And Charging Handle White

ABC RIFLE COMPANY AR-15 .223 Remington/5.56x45mm NATO Micro Pistol 5in Barrel M-LOK Handguard Upper Receiver w/BCG And Charging Handle Rose

ABC RIFLE COMPANY AR-15 7.62x39mm Micro Pistol 5in Barrel M-LOK Handguard Upper Receiver w/BCG And Charging Handle Flat Dark Earth

ABC RIFLE COMPANY AR-15 7.62x39mm 10in Quadrail Handguard Complete Pistol Upper Receiver w/BCG And Charging Handle Sniper Grey

Brigade Manufacturing AR Complete Upper Receiver Forged 5.56 5 inch Barrel Tungsten Charging Handle 5 inch Rail A2 Flash Hider

DPMS 223 A3 20-inch HBAR Barrel Assembly

DPMS 243 20 HBAR Barrel Assembly

Blackout Defense Complete Dual Taper Lock .300 AAC Upper Receiver Group Forward Assist 14.5in Pistol Green

Bilson Arms Pump Style Forward Charging Upper Assembly 350LGNDFC-UA 16 inch 1-16 Twist Cerakote Graphite Black

Bilson Arms Pump Style Forward Charging Upper Assembly 6mm Arc 18 inch 1-7 Twist Cerakote Graphite Black 416R- SS