Just to show you that I'm not the only one commiting errors, it was named MP 43 to mask it's continuance from Hitler when he prohibited it's development when it was known as the MC 42 (Machine carbine or something ... ), later on it became the StG. 44 when it was "oficially" recognized.
EDIT= Sigh, once more I have proven I completely suck. It was AKA the MP-44.
Obviously it had a tremendous recoil, being that it used the full-sized mauser cartridge, 7.92 x 54 (being used on any mauser bolt-action rifle, reports from my own grand father said some soldiers had their shoulders dislocated due to the recoil ... ) rather than the developed later on 7.92 x 33 Kurz cartridge used in the StG. 44.
I was aiming at a "scientifical" type of success, rather than combat-rated, being it that it brought some innovations.

Like the so called intermidiate round which generated the 7.62 x 39 AK round.
Now, end the WW II discussion, and back to the topic... and yes, it does quite remember the FG-42. It's bulky, side-fed and... looks good, needs a really good skin to match it up.
Just one thing: I think you should make the front sight smaller and add a dot or something.