So basically, in this mod, I have 'upgraded' pretty much every gun the game, making them faster, more powerful and more importantly, more fun! I have also tried to obviously keep the balancing of weapons fair and safe so that there are no ridiculously powerful weapons. This mod is for Combat Evolved and Custom Edition and is very easy to install, also it I am modding both campaign and multiplayer maps.
Download the modded map Gephyrophobia. With all the listed modifications except for the plasma rifle mod. If using Combat Evolved, then replace this file with the old one (I would recommend backing up the old ones just to be safe).