Thats right here is a small 3.0 mb quick vid tut tip on modeling a gun for pretty much any engiene coz the poly count is so low and whatch out for uv mapping and texturing it soon. Infact Whatch out for a series of vids from me soon. I may teach you beginners the full proccess of making games from modeling, texturing, programming, a simplel game.
http://www.3d-wiz.com/tuts/gun_modeling.zip
Also check out my tutorials section on my site for more great tips.