If you want the best an AR has to offer, then the 300 Series is your choice. This AR upper group is fitted with every desired feature including a choice of 10 Premier Cerakote colors, a CMMG RML15 M-Lok handguard, CMMG Oversized Ambi charging handle, and CMMG's SV muzzle brake. Chambered in 9mm, this upper group is ready for your next AR build. The MkGs platform accepts Glock 9mm-style magazines, and features a unique magazine release.