I have a nice mp5k complete lower assembly with a custom trigger job done by the legendary Bill Springfield to lighten the travel and creep of the trigger I also have an mp5k rear but plate with sling mount and 2 ar15 muzzle brakes one is a three prong supressor threaded 9mm muzzle brake and a standard 5.56x45mm Carlson flash enhancing muzzle brake thanks for looking I will trade for 9mm ammo