Nigel shows the officially licensed UMP AEG equipped with MOSFET.  There is also a GBB version... "The H&K Licensed UMP Competition grade AEG is a SMG replica that excels in close quarter combat but is capable of performing in outdoor environments as well."

The Top 5 Heckler & Koch Airsoft Builds by USAirsoft has another episode. Find out what viewers have submitted and liked... "Did you just freak out by seeing this in your sub box? Episode 2 of the very popular H&K Airsoft Build show is here and I'm super happy to have it up and ready for your eyes to enjoy. Will this blow up just like the last episode? I don't know but it doesn't matter to me if you alone love this rendition of The Airsoft Tops Series."