Complete Upper Receivers

The PWS MK1 MOD 2-M line, revamped for 2018, features the PWS long stroke piston system. While the internals remain the same as other PWS lines, the MK1 MOD 2-M offers a variety of features exclusive to this line. Starting with patent pending PicLok...

The PWS MK1 MOD 2-M line features the PWS long stroke piston system. While the internals remain the same as other PWS lines, the MK1 MOD 2-M offers a variety of features exclusive to this line. Starting with patent pending PicLok technology on the free...

Nordic Components' 22RB dedicated 22 upper receiver converts your standard AR-pattern lower to a dedicated .22LR for recreational shooting, training, and hunting. The 22RB is manufactured using the same materials as most standard AR15 rifles, ensuring...

The LA-SF15 RECON URG (Upper Receiver Group) is built to the highest quality standards and assembled by a skilled team of armorers. Each URG undergoes a shot test at Lantac's facility and includes a lifetime warranty against defects. The LA-SF15 URG...

The MR556 upper receiver kit has been updated to include all the new A4 features, including new barrel profile, adjustable gas block, handguard and more. This kit includes a complete upper receiver/barrel assembly, allowing Mil-Spec 5.56mm AR-style...

The groundbreaking MCR (Mission Configurable Rifle) belt-fed upper receiver assembly is designed to interchange with standard AR/M4 type uppers and readily fits any MIL-Spec lower receiver without permanent modification to the host lower, and is rearward...

The groundbreaking MCR (Mission Configurable Rifle) belt-fed upper receiver assembly is designed to interchange with standard AR/M4 type uppers and readily fits any MIL-Spec lower receiver without permanent modification to the host lower, and is rearward...

The groundbreaking MCR (Mission Configurable Rifle) belt-fed upper receiver assembly is designed to interchange with standard AR/M4 type uppers and readily fits any MIL-Spec lower receiver without permanent modification to the host lower, and is rearward...

The FX5500-U features Faxon's 14.5" Pencil Barrel with Integral Slim 3-Port Muzzle Brake which meets the NFA 16" minimum barrel length requirement, 13" Streamline Carbon Fiber Handguard, and Lightweight Bolt Carrier Group. Super light, easy shooting and...

This Daniel Defense M4A1 FSP AR15 style Upper Receiver Group was built for customers wanting a firearm inspired by USSOCOM SOPMOD Block II. This upper features the M4A1 FSP RIS II picatinny quad rail in Flat Dark Earth, a 14.5" M4 profile barrel,...

Meet CMMG's newest long-range offering. Chambered in Hornady's new 6mm ARC (Advanced Rifle Cartridge), the CMMG's RESOLUTE upper receiver group allows you to pair this exciting caliber with your existing AR15 lower for superior function and accuracy at...

CMMG's RESOLUTE lineup is engineered with purpose for those who refuse to compromise on quality. Each RESOLUTE rifle comes with a 16-inch barrel and is designed for balance, accuracy and maneuverability. Whether you're defending your family or looking to...