Shop 4,464 Deals on Upper Receivers

CMMG Mk47 7.62X39mm Resolute Upper Group Receiver 16.1in Sniper Grey

CMMG Mk47 7.62X39mm Resolute Upper Group Receiver 16.1in Charcoal Green

Wilson Combat Complete Upper Receiver Super Sniper .223 Wylde 20 inch Barrel Rifle Length 1-8 Twist 1/2x28 Thread M-LOK Handguard Q-COMP Armor-Tuff

Blackout Defense Complete Dual Taper Lock .300 AAC Upper Receiver Group Slick Side 14.5in Pistol FDE URGDTL300BLK14.5SLKFDE

Blackout Defense Complete Dual Taper Lock .300 AAC Upper Receiver Group Forward Assist 13.9in Pistol FDE

Blackout Defense Complete Dual Taper Lock .300 AAC Upper Receiver Group Forward Assist 9in Pistol Grey

Wilson Combat Complete Upper Receiver Recon 6.8mm Remington SPC 16 inch Barrel Mid Length 1-11 Twist 5/8x24 Thread M-LOK Handguard Q-COMP Armor-Tuff

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

CMMG Upper Group Resolute Fixed Ejector MkG . 45 ACP 16.1in 1-16 Twist 0.578-28 TPI Midnight Bronze

CMMG Upper Group Dissent Mk3 .308Win 16.1in Empire Profile Non-Threaded Sniper Grey

Rainier Arms RUC DI 5.56 Nato Partial Upper Receiver Black 10.5 in

Guntec USA AR-15 5.56 Complete Ultralight Series Pistol Kit No Lower Red

Tiger Rock Complete Upper Receiver AR-15 5.56 NATO 7in Pistol Length 1-8 Twist w/ 4in Super Slim Hanguard Black Large

Tiger Rock .308 AR-10 Rifle Build Kit Hybrid 17in 16in Barrel Heavy Mid 1x10 5/8x24 12in M-Lok Handguard Compensator Nitride Anodized Black

Tiger Rock Upper Receiver AR-15 Stripped Black Small

Luth-AR 20 in Bull Rifle kit minus Lower Receiver w/fixed stock M-Lok Black Rifle

Luth-AR 16 in Bull Rifle Kit Minus Lower Receiver w/Fixed Stock M-Lok Black Rifle

Spikes Tactical Upper 5.56 14.5in 16in OAL Midlength Lightweight LE w/Mid Length Handguards w/ Dynacomp

Spikes Tactical Upper 300BLK 16in w/13.2in SAR3 Rail

CMMG Upper Group Dissent Mk47 7.62X39 14.5in P&W 1-10 Twist 5/8 X 24 TPI .750in 27.5in Coyote Tan

Stag Arms AR-15 Upper Left Hand Receiver 5.56 NATO 16in Barrel Maryland Compliant HBAR Profile 1-7 Twist 1/2 x 28 Thread A2 Birdcage Flash Hider Black

Spikes Tactical Upper 300BLK 16in w/ BLK MOE Handguards & FSP

Aero Precision Complete Upper Receiver M4E1 .223 Wylde Mid Barrel EQ-15 HG No BCG/Charging Handle Gen 2 FDE Cerakote 16in APAR600252Q9

CMMG Dissent Mk4 .350 Legend 16.1in Upper Group 1-16 Twist 1/2x28 TPI 25.5.in .750in Coyote Tan