Quoting Hi-Jak .
To speak the truth,It looks like a cross between an UZI and a Mauser C96.The Uzi serise and Mac-10/11 also are designed to have rounds fed through the grip and theyre both SMGs (Actually the MAC-10 is a machine-pistol). And the SMG you made.....its a decent start but A:You should try and make it bigger and B:why not try cross overs? like take an AK-47 and combine it with an m16 and you'll have something pretty cool.
1. Thanks for your knowledge of guns! 2. Also thanks for the advice! I'll try to incorporate what you said into later weapons.