Looks like an AEG to me. Don't the Maruzens have a hollow pistol grip?
pilz, how did you mount that m4 stock? It looks like a neat setup.
Its a Tm Mp5k. The m4 stock was put on by a friend but i know how to take it off and how it works, First you have to take the buttplate off and take out the sling mount there should be a little washer thing that holds the sling mount in, its hard to get off but it comes off. The you take a M4 stock with the stock screw and you stick the stock screw into the buttplate
then you put a nut on the end of it and tighten it. then thats how you get a m4 stock on a mp5k.