Chambered in 9mm Luger and paired with the Zeroed 36 suppressor means this Mk4 ZEROED BANSHEE with its Fixed Ejector Radial Delayed Blowback operating system is optimized for suppressed shooting. The Mk4 lower receiver features a standard AR15 magwell and utilizes our 33rd or 10rd 9mm magazines. All Zeroed Banshee's feature our Zeroed premium controls/parts- like the ambi charging handle, single-stage drop in trigger, 60/90 ambi safety selector and pistol grip. Includes 33rd CMMG magazine and silicone SD handguard covers that simply pop into the M-LOK slots, allowing you to position them best to keep your hands nice and comfy.