the problem with weapon mods is there are so many different ones (even if they are all good ones) and it takes too long for a good player to adjust to the new tweaked weapons. There are so many factors to take into consideration when fighting someone - such as how much range he has, how good his gun's bullets are, how fast he reloads etc. That's why weapon modded server will only be joined by those seeking a little extra fun or simply can't stand the barret delay or inaccuracy of the HK.