Shop 4,464 Deals on Upper Receivers

Ghost Firearms Complete Upper Receiver Pistol Lower Parts Kit 5.56mm 10.5in Carbine 4150 M4 Barrel 1-7 Twist 11in M-LOK Free Float Hand Guard Flash

Ghost Firearms Upper Receiver Pistol Lower Parts Kit .300 Blackout 10.5in Pistol Moly Barrel 1-8 Twist 9in M-LOK Free Float Hand Guard A2 Flash Hider

Ghost Firearms Upper Receiver Pistol Lower Parts Kit .300 Blackout 10.5in Pistol Moly Steel Barrel 1-8 Twist M-LOK Free Float Hand Guard Burnt Bronze

CBC Industries Unassembled AR-15 Pistol Kit 18 in 6.5 Grendel Black

Primary Weapons Systems MK116 MOD 1-M Upper Receiver 7.62x39 16.1in Pistol Length 1-10 Twist PWS Triad 30 3-Setting Adjustable Gas System Black

Primary Weapons Systems MK111 MOD 1-M Upper Receiver 7.62x39 11.85in Pistol Length 1-10 Twist PWS Triad 30 3-Setting Adjustable Gas System Black

DEMO Radical Firearms Complete Upper Assembly 20in .450 Bushmaster 15in MHR Black

CLOSEOUT 300 WSM Complete Upper 19"

Complete AR15 Upper- Bravo Mount, 300BLK, 13.9" Pin/Weld (16" OAL)

KAK Complete AR15 Upper Receiver - 300 Blackout - 13.9" Barrel - 13" MLOK - 4 Prong Pin and Weld

KAK Complete AR15 Upper Receiver - .300 Blackout - 8.5" Barrel -7.2" MLOK

DEMO Aero Precision EPC-9 Threaded Complete Upper Receiver 11in 9mm w/ ATLAS S-ONE 10.3in Handguard Anodized Black

USED Aero Precision M5 Complete Upper Receiver 16in .308 CMV Mid Barrel w/ATLAS S-ONE 15in M-LOK Handguard Anodized Flat Dark Earth

Bilson Arms Pump Style Forward Charging Upper Assembly 9mm FC PCC-UA 9mm 16 inch 1-10 Twist Cerakote Sniper Green & Grey

Brenton USA Upper Receiver Scout 300 HAM'R 18in Barrel 5/8x24 Thread 1-15 Twist Autumn MarbleKote Autumn MarbleKote

Brenton USA Upper Receiver Scout 300 HAM'R 18in Barrel 5/8x24 Thread 1-15 Twist Foliage MarbleKote Foliage MarbleKote

Brenton USA Upper Receiver Tracker .350 Legend 22in Barrel 9/16x24 Thread 1-16 Twist Snow MarbleKote Snow MarbleKote

CMMG Upper Group Resolute Mk4 .22Lr 16.1in 1-16 Twist 1/2 X 28 TPI 24in Coyote Tan

Stag Arms AR-10 Long Range Right Hand Upper Receiver 6.5 Creedmore 24in Barrel NJ Compliant HBAR-CMV Profile 1-10 Twist 5/8X24 Thread VG6 Gamma FDE

POF USA Revolution DI Upper Receiver 308 WIN 18.5in Barrel Rifle Length 1-10 Twist 5/8x24 14.5in M-Lok Rail Triple Port Muzzle Break Black

Evolve Weapons Systems Assembled Upper Receiver 12.5in Patrol Gas System M-LOK Handguard Black

Jacob Grey Firearms Ultralight Complete Upper Assembly 7.62x39mm 10.5in Black

Jacob Grey Firearms Ultralight Complete Upper Assembly 5.56 NATO 10.5in Black

Alpha Shooting Sports 16 in .223 Wylde SSR15 Upper Reciever 1-8 Twist Mid Length