CMMG Endeavor 300, Complete Upper Receiver, 6MM ARC, 20" Barrel, Threaded 5/8-24, SV Brake, Black Color, Anodized Finish, RML15 Handguard with M-LOK, 10Rd, 3 Magazines 60F869D

CMMG's ENDEAVOR 300 Upper Group Kit is chambered in Hornady's new 6mm ARC (Advanced Rifle Cartridge). Designed for superior long-range accuracy" this upper group kit features a 20-inch barrel and includes three 10-round magazines so that you can easily pair with your existing AR15 lower receiver and squeeze out every drop of ballistic performance from this exciting new caliber.