Just the fact that the chance to hit a particular non-armor-ability component first on any given shot is linearly proportional to the hitpoint, the chance to hit a particular armor-ability component first seems to be inversely proportional to the hitpoints, and that in most situations, armor components with fewer hitpoints will be hit first 70-90% of the time as SJ stated. Though I guess only the first item really applies to *leaky* armor
