HALO is one FPS that really did introduce many new gameplay elements. It offers all that is said below and the modifications already in development look to refine and improve the "HALO experience" even more!
This tutorial covers modelling, unwrapping, texturing, animating, tagging, and creating sound FX for a custom UMP .45 for Halo: Custom Edition. If you have any questions you can PM me here on moddb or check the readme.txt for more contact info. This file only contains the resource files for people who want to follow along as I upload to youtube. I will upload a larger file later that contains all of the videos as well for anyone who doesn't want to wait for each video to be uploaded to youtube.