CMMG 57A889D-AB: CMMG Banshee line of pistols offer maximum portability and concealment. Standard features include air craft grade aluminum receivers; Zeroed pistol grip, drop-in trigger, polymer dust cover, ambi-charging handle; M-LOK free float handguard and Cerakote finish. The Mk57 platform is designed to use FN Five-seveN pattern magazines and still offers the full range of AR15 operational features like last round bolt hold open and can utilize standard AR15 triggers.