You are more likely to cause Critical Hits in combat if you have this Perk. Each level of More Criticals will get you a +5% chance to cause a critical hit. This is a good thing.”— in-game description, Fallout
Fallout, Fallout 2, Fallout Tactics, Van Buren and LionheartEdit
With each level of this perk, you get an additional +5% chance to cause a critical hit.
J.E. Sawyer's Fallout Role-Playing GameEdit
When you score a hit in combat, add 20 to the attack roll for purposes of determining critical hits.