The "Predator" style mini-gun model is something I did one day just screwing around. It's based off of a high poly model that I got here: http://www.ozemail.com.au/~dproc/
The poly count is still quite high for a weapon (763 polys!), so it probably still needs to be reduced some. Also, it has not been textured or animated. If anyone does end up using it, you may want to give the original model's author some credit (see the above link).