THere are 5 possible mods, and all weapon mods have 3 levels - basic (no prefix), advanced, and superior. Bonuses listed as x/y/z correspond to those 3 levels.


 - **Stock** - 1/2/3 Guaranteed damage on a miss.
 - **Auto-Loader** - 1/2/3 Free Reloads per mission. (Reloading doesn't cost an action)
 - **Repeater** - 5/10/15 percent chance to instantly kill an enemy, regardless of remaining health. ("Executed" text will pop up when this triggers)
 - **Sight** - 5/10/15 Aim bonus when using the upgraded weapon. (Does not apply to secondaries)
 - **Laser Sight** - 5/10/15 Crit chance when using the upgraded weapon. (Does not apply to secondaries)