The CMMG Resolute 300 5.7x28mm upper receiver has a 16.1-inch barrel and features CMMG’s patented Radial Delayed Blowback operating system. The receiver and hand guard are hard coat anodized and come with a pre-installed CMMG ambidextrous charging handle, CMMG SV Brake and a CMMG RML15 M-LOK Hand Guard.
- CMMG RML15 M-LOK Hand Guard
- CMMG’s patented Radial Delayed Blowback
- CMMG Oversized Ambi charging handle