CMMG Banshee Upper Group Kit 300 MK57 5.7x28 3-40rd Mag

The BANSHEE 300 5.7x28mm upper receiver has a 5-inch barrel and features CMMG’s patented Radial Delayed Blowback operating system. The receiver and handguard are hard coat anodized, and come with a pre-installed CMMG Ambi Charging Handle, and a CMMG RML4 M-LOK handguard. This package ships with three 40-round 5.7 AR Conversion magazines.