The Heckler & Koch UMP is a submachine gun developed and manufactured by Heckler & Koch. The UMP has been adopted by numerous agencies worldwide including the French Gendarmerie National and U.S. Customs and Border Protection. Heckler & Koch developed the UMP as a successor to the MP5 though both remain in production.
Design Details Edit
The UMP is a blow-back powered, magazine fed submachine gun firing from a closed bolt. As originally designed, the UMP is chambered for larger cartriges than other submachine guns like the MP5 , to provide more stopping power against unarmored targets (with a slightly lower effective range) than the 9x19mm MP5 provides. A larger cartridge produces more recoil, and makes control more difficult in fully automatic firing. To mitigate this, the cyclic rate of fire was reduced to 650 rounds/min (600 rounds/min for the UMP45), which makes it one of the slower firing submachine guns on the market.
The UMP9 (the 9x19mm version of the UMP) is almost 0.45 kg (almost 1 lb) lighter than its MP5 counterpart. Its predominantly polymer construction reduces both its weight and the number of parts susceptible to corrosion. These polymers stand up well to wear and tear in the field.
There are three versions of the UMP: the UMP45, firing a .45 ACP cartridge; the UMP40, firing a .40 S&W cartridge; and the UMP9, firing a 9x19mm Parabellum, cartridge. Apart from the different chambering, all versions feature the same basic design, the most noticeable difference being the curved magazine used on the UMP9 (whereas the UMP40 and UMP45 use a straight magazine). All three versions of the weapon can be converted to any of the available chamberings via replacement of the bolt, barrel, and magazine.
The USC or Universal Self loading Carbine is a semi-automatic version of the UMP that could be owned by private citizens for sporting purposes. It was designed following the Assault Weapons Ban of 1994 in the United States and conforms to those standards. Changes from the original UMP include a "thumbhole" type stock and grip (versus the pistol grip of the UMP), longer barrel, limited 10-round magazine, and semi-automatic only trigger group and action. Originally available in gray, as of early 2007 the USC comes only in an all-black finish.