Here is my Uzi I made with Digital Design. I found an old toy, that I believe is full size, and took measurements to help make this model. The grip is 4 studs wide and 6 studs long. I'd like to widen it to 5 studs so I can insert a 3 x 4 removable clip. I like adding details like that.
low on detail, ex. no cocking bolt on top, curved forward grip, missing a magazine, the handgrip is also way out of proportion, trigger would be nice, back area is also a bit off proportionally, see my uzi for some ideas