Closed bolt
Videos
A semi or fully automatic firearm which is said to fire from a closed bolt or closed breech is one where, when ready to fire, a round is in the chamber and the bolt and working parts are forward in ba
A Heckler & Koch G36, an example of a rifle that fires from a closed bolt
Heckler & Koch UMP
Videos
The Heckler & Koch UMP is a submachine gun developed and manufactured by Heckler & Koch. Heckler & Koch developed the UMP as a lighter and cheaper successor to the MP5, though both remain in productio
HK UMP45 with a KAC vertical foregrip
Heckler & Koch MP5A5 (top), MP5A4 (middle) and UMP9 (bottom), on display at a Navy armoury exhibition
UMP9 (top) and MP5 E6 (bottom) on display at Military University of Technology
UOPI operator with a UMP9