I don't mean to bash this model or anything, but it's not really worth three dollars to me.
Some pointers;
-Animation is stiff, fingers don't move.
-Walking animation is not very realistic, try slowing it down and see if it helps.
-Fingers aren't positioned very well.
Now I know that modeling is hard stuff, but if I were you I would have given it for free. I'm not saying I want it for free, but I would have paid for something like, a pack of ten weapons for, I dunno, $13.00 or something. Try not to sell anything until you have some positive constructive criticism from the community.
But still, keep pluggin' away, you'll get better with practice.
Best.
