H&K UMP (Universale Maschinenpistole, German for "Universal Machine Pistol" ) is a submachine gun (SMG) developed by H&K. It developed as a successor to the MP5, though both remain in production.

UMP is designed to chamber larger cartridges to provide more stopping power against unarmored targets than the 9x19mm MP5 provides. Due to the more recoil and worse handling in full-auto firing, the cyclic rate of fire was reduced to 600-650 round per minute in order to have easy-control for the shooter.

Here's the variant of the UMP: the UMP45 which fires .45 ACP cartridge; the UMP40 which fires .40 S&W cartridge; the UMP9 which fires the 9x19mm cartridge same as MP5 and the USC (Universal Self-loading Carbine), which is the civilian version fires in semi-auto for sporting purposes.

Features:
Full Licensed H&K Trademarks.
Metal UMP Flash Hider which compatiable with VFC UMP QD Silencer.
Polymer body frame which can add 2 Side Rails, 1 Lower Rails and 1 Top Rail and allows user to  attach Scopes, Flashlights, Laser Sights, RIS Foregrip, etc.
Foldable UMP style Rear Stock.
Install with VFC GBB System with 2 round burst shooting mode.
Integrated Front and adjustable Rear iron sights.
Functional Charging lever & Bolt Catch.
Ambi Fire Selector (Safe, Semi-auto, 2-round burst, Full Auto).
Adjustable Hopup system which the adjust lever located under the front sight.
Metal Bolt Carrier with full trademark and can be adjusted for less or more blowback power.
Sling mount can be installed with any single, 2- or 3- point tactical sling.
Ready to go for 330 – 340 FPS (12 KG Gas) without modification.
Include 25 Rounds UMP Gas Magazine, the capacity can be extended to 30 rounds by removing the small metal rod located in the magazine tube.
Deluex Version comes with a Top Rail, Spare Soft Recoil Spring and a UMP QD Silencer.

Specifications :
Length : 695mm, 455mm (Stock folded)
Length (with QD Silencer): 865mm, 620mm (Stock folded)
Barrel Length : ~190mm
Shooting Mode : Safe, Semi-auto, 2-round burst, Full Auto
Weight (Gram): 2005 (gun with magazine), 2230 (gun with all accessories), 2890 (With Box)
Color : Black
System: VFC GBB System
Power Source : 12 KG Gas (Green Gas)
Magazine Capacity : 25 rds (Can be modified to 30 rounds)
Materials : Polymer, Metal
Bullet Type : 6mm BB
Power (Muzzle Velocity) : 330 - 340 FPS (12KG Gas)
Manufacturer: UMAREX