Shop 4,464 Deals on Upper Receivers

XTS Complete Upper Receiver w/o BCG AR-15 223/5.56 16.5in 7.5in Pistol 1-7 Twist 1/2x28 Thread M-LOK Bird Cage Black Nitride Finish Silver

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 Red

Rainier Arms Rellim Arms AR-15 5.56 Nato Take Down Upper Receiver Assembly Black 16 in RA-TDURA-556-16

Rainier Arms Rellim Arms AR-15 .223 Wylde Take Down Upper Receiver Assembly Black 8.5 in RA-TDURA-223-8-5

DEMO CMMG Mk4 Resolute Upper Receiver Group 7.62x39mm 16.1in Armor Black 76BFCB4-AB

DEMO Jacob Grey Firearms Ultralight Complete Upper Assembly .300 AAC Blackout 10.5in Black 300BO105ULCUA

DEMO Daniel Defense Upper Receiver w/Flash Hider Assembly DD5 V5 URG 6.5mm 20in Barrel S2W Profile Rifle +1 Length 1-8 Twist 5/8x24 Thread M-LOK

Ghost Firearms Elite Complete Upper Receiver 9mm 9x19 Para 16 inch 4150 Light HBAR Barrel 1-10 Twist 14 inch M-LOK Free Float Hand Guard A2 Flash

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 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 4150 Light HBAR Barrel 1-8 Twist 11in M-LOK Free Float Hand Guard

Ghost Firearms Upper Receiver Pistol Lower Parts Kit 7.62X39 10.5in Carbine Light HBAR Barrel 1-10 Twist 9in M-LOK Freefloat Handguard A2 Birdcage

Ghost Firearms Upper Receiver Pistol Lower Parts Kit 5.56mm/.223 10.5in Carbine Moly Barrel 1-7 Twist 9in M-LOK Free Float Hand Guard A2 Flash Hider

Ghost Firearms Upper Receiver Pistol Lower Parts Kit 5.56mm/.223 10.5in Carbine 4150 Moly Steel Barrel 1-7 Twist 9in M-LOK Free Float Hand Guard A2

EDEMO OpticsPlanet Exclusive Moriarti AR-15/47/9/300 Billet Upper Receiver Slick Side no Forward Assist Anodized Black UPPER-SLICK EDEMO2 Used

USED Grid Defense Complete Upper Receiver 5.56mm 10.5 inch Carbine Length 4150 Steel M4 Barrel 1-7 Twist A2 Flash Hider Flat Dark Earth

No Brand BC-15 .458 SOCOM Right Charging Tungsten Cerakote Upper Parkerized 16" Heavy Barrel 1:14 Twist Carbine

No Brand BC-15 .458 SOCOM Right Side Charging ODG Cerakote Upper 16" Parkerized Heavy Barrel 1:14 Twist Carbine

No Brand BC-15 12.7x42 Right Side Charging Tungsten Cerakote Upper 18" Parkerized Heavy Barrel 1:20 Twist Mid-Length

Bear Creek Arsenal BC15 12.7x42 18in Upper Receiver Heavy Mid-Length 1-20 49/64x20 Flash Hide Parkerized ODG

Bear Creek Arsenal BC-15 6mm ARC 20in Bolt Action Style Upper Receiver Straight Fluted Heavy 1-8 5/8x24 Flash Hider 416R

CBC Industries Unassembled AR-15 Rifle Kit 16 in 0.223 Wylde 12in Hanguard Straight Flute Black

CLOSEOUT 300 WSM Complete Upper 19" KEYMOD VERSION

Moriarti AR-15 7.62x39mm 5 inch Upper Receiver Government Micro Length 1-10 Twist 5/8x24 A2 Flash Hider Nitride