Personally, I'd recommend making his teeth through alpha masks, rather than using extra polys, as you are now doing. You should be able to get a pretty good effect that way, while saving quite a few polys for other areas. Also, I think you might need to do a little edge turning here or there. I'm noticing the forearms particularly.
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I went with planes for the teefs and did a lot of edge turning/optimization. First pass on gun, what say you guys?