Compact and capable the CMMG Mk4 originally created for optimum performance in subsonic, suppressed and short-barrel applications in supersonic ammo loadings. Features EML handguards, full length M-LOK slots on both sides and the bottom of the handguard as well as M-LOK between the top picatinny rail sections; ZEROED parts including: pistol grip, drop-in trigger, 60/90 degree ambi safety, linear compensator, ambi mag catch, extended mag release button, ambi charging handle, bolt catch and polymer dust cover. Includes 30rd PMAG magazine.