Engineering & Technical Division

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Following are photos of a Version 3 gearbox from a UMP smg.


Showing the gearbox after pulling it from the lower receiver.



Showing the internals as they are in positioned inside the gearbox.



Highlighting the gears, sector, spur and bevel gears.



Showing the cylinder, piston, spring and tappet plate how they are assembled together.



And this is the gearbox placed in the lower receiver of an HK UMP. The version 3 gearbox is also compatible with the MP5 and AK series.


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