Shop 4,464 Deals on Upper Receivers

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

Aero Precision M5 Threaded Stripped Upper Receiver Uncoated

Aero Precision M4E1-T PRO CHF M4 5.56mm 16 inch Complete Upper Receiver Hanson Mid Length 1-7 Twist A2 Birdcage Anodized Black

Aero Precision M4E1-T PRO CHF M4 5.56mm 14.5 inch Complete Upper Receiver Hanson Mid Length 1-7 Twist A2 Birdcage Anodized Kodiak Brown

Aero Precision AR-15 5.56x45mm NATO Complete Upper Receiver w/ No Forward Assist 11.5in 5.56 Barrel 9in M-LOK ATLAS S-ONE Handguard Anodized Black

Blackout Defense Complete Dual Taper Lock .223 Wylde Upper Receiver Group Forward Assist 11.5in Carbine Grey

Blackout Defense Complete Dual Taper Lock .223 Wylde Upper Receiver Group Slick Side 11.5in Carbine Burnt Bronze

Brigade Manufacturing AR Complete Upper Receiver Forged 9mm 9 inch Barrel Black Mini Can 8 inch Rail No Charging Handle NO BCG

Steambow AR-Series-M10 Upper Black Unisex

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

CMMG 9mm Banshee Upper Group Receiver 5in 1-10 Twist 1/2 X 28 TPI 13.7in Midnight Bronze

CMMG MkG .45 ACP Banshee Upper Group Receiver 8in Coyote Tan

CMMG Mk4 .350 Legend Resolute Upper Group Receiver 16.1in Titanium

XTS Complete Upper Receiver w/o BCG w/ 12in Rail AR-15 223/5.56 24.75in 16.5in Carbine 1-8 Twist 1/2x28 Thread M-LOK Bird Cage Black Nitride Finish

XTS Complete Upper Receiver w/o BCG w/ Ce Rail USA Edition AR-15 19.5in 10.5in Barrel Pistol 1-7 Twist 1/2x28 Thread M-LOK Stainless Steel Bird Cage

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 Blue

Guntec USA AR-15 9mm Dedicated Stripped Billet Upper Receiver Green

Rainier Arms Ruc Pro Mk1 5.56 Nato Partial Upper Receiver Black 11.5 in

CMMG Dissent Mk4 6mm ARC 16.1in Upper Group 1-7.5 Twist 5/8 X 24 TPI .750in 25.5in Armor Black

CMMG DISSENT Mk4 300BLK 16.1in Upper Receiver 1-7 Twist 25.5in 5/8x24 TPI .750in Sniper Grey

CMMG Resolute Mk3 8.6 Blackout 16.1 inch Upper Receiver CMM

Brenton USA Upper Receiver Tracker .204 Ruger 22in Barrel 1/2x28 Thread 1-12 Twist Midnight MarbleKote Midnight MarbleKote

Brenton USA Upper Receiver Scout .223 Remington 18in Barrel 1/2x28 Thread 1-8 Twist Harvest MarbleKote Harvest MarbleKote

Brenton USA Upper Receiver Tracker .223 Remington 22in Barrel 1/2x28 Thread 1-8 Twist Autumn MarbleKote Autumn MarbleKote