Filter
Top Products
14
UMP SUBMACHINE GUN
Assembly Group 3
Lower receiver with trigger mechanism
The lower receiver houses the trigger mechanism with safety/selector
levers, the backplate, the magazine well, magazine release lever and
bolt catch. The forward portion of the lower receiver is hooked to the
upper receiver. The rear portion is fastened to the upper receiver using a
removable locking pin.
The safety/selector levers are fitted on both sides of the pistol grip.
The forward portion of the lower receiver has lugs for attachment to the
upper receiver. Behind these lugs is the magazine well with the
magazine release lever.
Above the magazine release lever is the bolt catch. It serves to hold the
bolt rearward when the last round is fired and to release the bolt from
the open position after an empty magazine has been replaced with a
loaded magazine.The rear side of the lower receiver includes the
integrated backplate with buffer and support for the recoil spring
assembly.
The safety/selector lever of the "Navy" trigger mechanism has three
positions :
Position = Safe
Position = Semi Automatic fire
Position = Fully Automatic fire
Trigger Mechanism Variants
Trigger mechanism for single fire, 2-round burst and fully automatic fire.
The safety/selector lever has four positions :
Position = Safe
Position = Semi Automatic fire
Position = 2-round burst
Position = Fully automatic fire
NOTE: UMP trigger mechanisms with various combinations of the
above firing modes and possibly others may also be available for the
UMP Submachine gun.