Reno Blade, on 29 October 2014 - 08:25 AM, said:
first rule:
If you have still armor (front and back for torso) after the damage is applied, there is no roll for a crit.
second rule:
if the armor is breached, or you don't have any armor, the internal structure is damaged by the remaining damage and there will be a roll if there is a crit (1x, 2x or 3x).
third rule:
critical damage depends on the weapon damage, not the actual inflicted damage.
An AC20 piercing a section with 19 armor will inflict 1 damage to internal structure
if there is a crit, it will deal 20 points of damage to the crit item (like a Gauss with 3 health, or a Ammo with 10 health, or even a shoulder actuator for 10 health)
If you have crit an item, then 15% of that damage is also dealt to internal structure.
crit chance is higher for LBX, MG, Flamer and clan targeting computer.
fourth rule:
if a section (arm, leg or side torso) is destroyed and you hit the section, you will only transfere 50% of the damage to the next inward section
going from leg/arm to side torso and then towards center torso.
Hit to a destroyed arm will transfer 50% to a torso and if that is destroyed, the damage is further reduced by half to deal 25% to the Center torso.
note: each tick of a laser (roughly every 0.2 damage), each pellet of LBX or UAC, Missile or MG/Flamer will be rolled seperately for crits.
More information about crits can be found here:
http://mwomercs.com/...-a-brief-guide/
edit:
from the linked thread:

You can spout all the rules from some other guy on the forum all you want, but the fact remains in my personal experience you can lose a weapon before your armor in that section is gone, especially in an Atlas, and if you read the posts of other Atlas pilots in this very thread you'll see I'm not the only one, and you can witness this yourself if you do like I said. I've also lost my LRM rack on my Direwolf on more than one occasion with an only slightly damaged torso.



















