This looks really cool, but at the same time it's also a little bit sloppy.
Still, I do really like this, and while in a close-up the mesh and wrap are painful, in-game as an attachment it looks good.
The first segments of the sides of the handle have the wrap totally stretched in lines. Those are only a few miswrapped polies, but their placement makes them crucial to the overall appearance of the model.
3/5.
Edit: I'm glad you fixed a few small things; those little things made such a huge difference, and it definitely looks a lot better, now. 4/5.