CMMG, Mk57 Resolute 300, Semi-automatic Rifle, 5.7X28MM, 16.1″ Barrel, 1:9 Twist, Aluminum Frame, Midnight Bronze Cerakote, CMMG RipStock, SV Brake, Threaded 1/2-28, CMMG RML15 MLOK Hand Guard, 20Rd ProMag Magazine