Shop 4,464 Deals on Upper Receivers

Spikes Tactical Upper 5.56 14.5in 16in OAL Midlength Lightweight LE w/13.2in BAR2 Rail & Dynacomp

Spikes Tactical Upper 300BLK 16in w/7in SAR3 Rail & FSP

Spikes Tactical Upper 300BLK 16in w/12in SAR3 Rail

Brigade Manufacturing AR Complete Upper Receiver Forged 5.56 7.5 inch Barrel Tungsten Charging Handle 7 inch Rail A2 Flash Hider

LaRue Tactical Upper Reciever Complete .260 Keymod Upper 22 in Barrel Flat Dark Earth Medium DPMS Cut

Luth-AR 18 in Mark 12 kit minus Lower Receiver w/fixed stock Black Rifle

Matador Arms MAT916 Upper Reciever FDE 23.5in

Rock River Arms Completed Upper Receiver Entry Tactical A4 .223/5.56mm 16 Inch Barrel 1-9 Twist 1/2-28 Thread R4 Handguard A2 Flash Hider Black

Rock River Arms Completed Upper Receiver Left Handed RAGE .223/5.56mm 7 Inch Barrel 1-9 Twist 1/2-28 Thread Free-Float Handguard A2 Flash Hider Black

UnbrandedAR AR15 Rifle Build Kit 16in Barrel 15in Rail Black

TRYBE Defense Complete Upper Receiver AR-15 5.56 16in 5R Barrel 1-7 Twist 15in M-LOK A2 FH BCG/CH Black w/ TRYBE AR-15 Extended Grasp 10-Round

Aero Precision Complete Upper Receiver M4E1 14.7in 5.56 Mid Pencil Barrel EQ-12 HG Gen 2 Anodized Black

Brenton USA Upper Receiver Ranger Carbon Hunter 6.5mm Grendel 22 in Barrel 5/8x24 Thread 1-8 Twist Nitride Snow MarbleKote

ABC RIFLE COMPANY AR .40 S&W Billet Pistol 4in Barrel Custom M-LOK Handguard Complete 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 Bronze

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 AR9 9mm Luger Rifle Billet 16in Barrel M-LOK Handguard Complete Upper Receiver w/BCG And Charging Handle Cerakote Burnt 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 .223 Remington/5.56x45mm NATO Pistol 7.5in Barrel M-LOK Handguard Complete Pistol Receiver w/BCG And Charging Handle Bronze

ABC RIFLE COMPANY AR-15 7.62x39mm Micro Pistol 5in Barrel M-LOK Handguard Upper Receiver w/BCG And Charging Handle Robbin's Egg Blue

CMMG Upper Group Dissent 45 Acp 16.1in 1-16 Twist 0.578 X 28 TPI 25.5in Charcoal Green

CMMG Upper Group Dissent 45 Acp 6.5in 1-16 Twist 0.578 X 28 TPI Charcoal Green

CMMG DISSENT Mk4 300BLK 14.5in P&W Upper Receiver 1-7 Twist 5/8 X 24 TPI .750in 23.6in Titanium

CMMG 9mm Banshee Upper Group Receiver 8in Titanium