(Yaaay, I like automatics)
About the mp40. Does this look good?

VS.

...and...
VS.

You should make the top rounded(as in a octagonal/hexagonal shape), add more detail(IE. the rigid areas, the switch, maybe re-color it, etc.). Looks pretty good so far though! Plus, re-do some wooden parts on the Thompson :3
P.S. I could BETA-test for you.