Offworlder said:
First one, SMG thing have't given it a name, feedback please.
Your technical is all over the place, but that's obviously not important here. You've got the magazine feeding to the wrong spot, and your foregrip isn't attached properly, giving it a bit of an awkward shape. However, I like the placement of the stock in relation to the barrel.
On a side note, a sub-machine gun is a gun in a rifle layout that fires pistol calibre rounds (9mm, .45, etc), You've got a magazine that holds intermediate rounds (assault rifle rounds - 5.56, etc), making it a short assault rifle or carbine.
Keep it up, and look at the regulars here to see how to put the bits together properly, and I will look forward to more from you.