Well first of all what modelling program are you going to use, I will assume gmax, for now anyway. So
First of all the gmax link:
http://www.turbosquid.com/gmaxSecond of all:
http://hce.halomaps.org/index.cfmThis link should help, just scroll down the page until you find a tutorial you like, the Custom Weapon Video Tutorial one's come in 5 parts so remember to download all 5.
Thirdly, but sure as hell not leastly, remember, just becuase you don't get it right the first time doesn't mean you should give up, try again, get better. And finally, Good luck.
-PwN Lone
P.S: If you are using an alternate modelling program such as the 3ds max products, search for the beretta 9000 modeling tutorial in Google. That is a very good tutorial which teaches a lot.
Edited by Lone Warrior on Dec 16, 2008 at 02:07 PM