Shop 4,464 Deals on Upper Receivers

CMMG MkG Resolute Upper Receiver Group .45 ACP 16.1in Armor Black

CMMG Dissent Mk4 5.56mm 16.1in Upper Group 1-7 Twist 1/2 X 28 TPI .750in 25.5in Titanium

CMMG Resolute 300 Upper .22 LR 16 Barrel 25-Round Magazine

American Defense Manufacturing 5.56 14.5 Inch Barrel M-Lok Rail Upper Reciever Flat Dark Earth 14.5 in

Aero Precision M4E1-T Complete Upper Receiver Threaded 5.56x45mm Mid Pencil 16in Barrel ATLAS S-ONE 12in Handguard M-LOK Anodized Black

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

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

Unique-ARs Original Wicked Wings Complete Upper Receiver Cerakote Armor Black/Anodize Black

Unique-ARs Slim Molon Labe Complete Upper Receiver Cerakote Armor Black/Anodize Black

CMMG Dissent Mk4 .300BLK 16.1in Empire Profile Upper Group Tungsten

Tiger Rock Complete Upper Receiver AR-15 5.56 NATO 16in Mid Length 1-7 Twist w/ 16in Keymod Handguard Black Large

Tiger Rock Complete Upper Receiver AR10 .308 20in Rifle Length 1-10 Twist w/18 M-LOK Handguard Black Large

XTS Complete Upper Receiver w/o BCG w/ 12in Rail AR-15 300 BO 24.75in 16in Barrel Carbine 1-8 Twist 5/8x24 Thread M-LOK Bird Cage Black Nitride Finish

XTS Complete Upper Receiver w/o BCG w/ 12in Rail AR-15 300 BO 24.75in 16in Barrel Carbine 1-8 Twist 5/8x24 Thread M-LOK Bird Cage Black Nitride Finish

XTS Complete Upper Receiver w/o BCG AR-15 300 BO 17.5in 8.5in Pistol 1-8 Twist 5/8x24 Thread M-LOK Bird Cage Black Nitride Finish Purple

XTS Complete Upper Receiver w/o BCG AR-15 223/5.56 24.75in 16.5in Carbine 1-8 Twist 1/2x28 Thread M-LOK Bird Cage Black Nitride Finish OD Green

V Seven 6.5 Creedmoor Complete Upper 20in 20 6.5CM-UR

USED Fostech FLITE Elite Stripped Upper Reciever Tungsten

FN America FN USA FN 15 Military Collector Series M4 Complete Upper Receiver Assembly 5.56mm 16 Barrel E426C7AC RJ

Bushmaster A4 Stripped Upper Receiver Black

WMD Guns AR-15 A3/A4 Upper Receiver Forged w/M4 Feed Ramps NiB-X Northern Lights 1-NIBXURF-Northern Lights

Ghost Firearms Vital Complete Upper Receiver .300 Blackout 7.5in Pistol Length 4150 Light HBAR Barrel 1-8 Twist 7in M-LOK Free Float Hand Guard A2

Ghost Firearms Complete Upper Receiver Pistol Lower Parts Kit 9mm 7.5in Pistol Length 4150 Chrome Moly Steel Barrel 1-10 Twist 7in M-LOK Rail A2 Flash

Ghost Firearms Elite Complete Upper Receiver 9mm 9x19 Para 7.5 inch 4150 Light HBAR Barrel 1-10 Twist 7 inch M-LOK Free Float Hand Guard A2 Flash