.300 BLK. Suppressor-ready platform with an SD handguard and inert training device. To have a suppressed MCX system, unthread the inert training device, install your suppressor, and select the appropriate gas setting for your ammunition. Two-stage flat-blade match trigger, Cerakote E190 finished upper and lower, a folding coyote-tan PCB, and one 30-round polymer 300 Blackout Magpul magazine.