Talk:Mods 2.0/@comment-220.255.2.134-20130425053327/@comment-75.18.227.164-20130425060950

As many people have been surprised to learn, Crit mods only multiply a weapon's base crit chance. A mod that increases crit chance by 100% as in your example merely doubles your weapon's chance to crit.

Base crit chance is not known for all weapons. This is because crit chance is not displayed in game and must be determined for each weapon through extensive in-game testing. The Crit chance for certain weapons has been displayed in patch notes, however weapon values shown in patch notes for weapons have been frequently shown to be inaccurate.

Fortunately, the wiki page for weapons with a high crit chance will frequently list said weapon's crit chance, and the information is usually accurate. If the crit chance for a weapon is not listed or mentioned on that weapon's wiki page then assume that said weapon has an extremely low crit chance and that crit mods are not optimal for said weapon.