Heckler Koch UMP 45 airsoft gun smg. The item “Heckler Koch UMP 45 airsoft gun smg” is in sale since Tuesday, September 29, 2020. This item is in the category “Sporting Goods\Outdoor Sports\Airsoft\Guns\Electric\Rifle”. The seller is “silent_4874″ and is located in Dexter, Michigan. This item can be shipped to United States.