Shop 4,464 Deals on Upper Receivers

Bear Creek Arsenal BC-15 .450 Bushmaster 18in Bolt Action Style Upper Receiver Heavy Barrel 1-24 Twist 5/8x32 Flash Hider 416R

DEMO Caracal CAR816 A2 Patrol 5.56x45mm NATO Complete Upper 11.5in Barrel

CBC Industries Unassembled AR-15 Pistol Kit 5 in 7.62X39 Black

CBC Industries Unassembled AR-15 Pistol Kit 7.5 in 7.62X39 Black

CBC Industries Unassembled AR-15 Rifle Kit 16 in 300AAC Black

CBC Industries Unassembled AR-15 Rifle Kit 16 in 5.56 Black

DEMO Vltor Modular Upper Receiver with Bolt Assist and Shell Deflector Foliage Green MUR-1AG

DEMO Midwest Industries Upper Receiver Group 16 inch Barrel .223 Wylde 15 inch Combat Series M-LOK Handguard Mid-Length A2 Flash Hider Black

FM Products MIKE-45 .45 ACP Build Kit 10 inch Front Charge 4-Port Micro Brake Black

Sons of Liberty Gun Works L89 Complete Upper Half 13.9in 5.56 Cold Hammer Forged Barrel Broadsword upper 13in L89 Rail P/W NOX9 No BCG or CH Black

USED Watchtower Firearms Left Stripped Billet Upper Receiver Black LFT-UDR-BLK EDEMO2 Condition Fair Scratches

DEMO Colt Upper Assembly Kit AR-15 16.1 in 5.56x45mm 1-7 Twist 1/2x28 No Handguard Black

USED OpticsPlanet Exclusive Faxon Firearms Complete Upper Receiver ARAK-21 16in 5.56 MuzzLok Sand URSSB556-OP-SND

USED Next Level Armament NLXPRIME Billet 5.56mm AR-15 Complete Upper Receiver 16 in Barrel 1-7 Twist M-LOK Handguard Helix Flash Hider Black NLX308

KAK Complete AR15 Upper Receiver - 9mm - 8" Barrel - 9" MLOK

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

ABC RIFLE COMPANY AR-15 .300 AAC Blackout Complete Build 16in Barrel 15in Lightweight Hybrid M-LOK Handguard Upper Receiver 5/8x24 Nitride Olive Drab

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

ABC RIFLE COMPANY AR 9mm Luger 16in Barrel Slim M-LOK Upper Receiver w/BCG And Charging Handle 1-10 Twist A2 Style Muzzle Brake Nitride Black

ABC RIFLE COMPANY AR9 9mm Luger Pistol 4in Barrel M-LOK Handguard Complete Upper Receiver w/BCG And Charging Handle Bronze

ABC RIFLE COMPANY AR-15 .223 Remington/5.56x45mm NATO Micro Pistol 5in Barrel Custom 5in Top Cut Custom M-LOK Handguard Complete Upper Receiver w/BCG

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

Guntec USA AR-15 Stripped Billet Upper Receiver w/12in Ultralight Series M-Lok Handguard Purple

Guntec USA AR-15 Stripped Billet Upper Receiver w/12in Ultralight Series M-Lok Handguard Flat Dark Earth