It was a trick question, sorry about that

It's the result of a brain fart I had last christmas. The trigger housing is from a MKIII, and the mags are indeed ppsh. The front end is sten MkII. It has a newly designed magwell thingy, a new tube to feed vertically and a bolt that's been cut and rotated 45 degrees. It works well with 9mm but can easily be converted to 7.25x25 by replacing the barrel..