When an AC20 hits internals, it rolls for crit, and if it crits 1-3 items are automatically destroyed.
When an LB20X hits internals, only the pellets that actually hit the exposed internals get to roll for crits, of those pellets about 67% will crit for 2-6 damage, but that 2-6 damage will be distributed randomly among all the items in the hit location. So theres no guarantee that youll even destroy one item. While the AC20 guarantees you destroy 1-3 items on a crit.
But WAIT it gets even better for the AC20. Even if an AC20 only does 1 point of damage to internals, it still gets to roll for crits doing its full damage. If an AC20 does 1 damage to your internals, it can still destroy 1-3 items on a crit! This is a huge advantage for the AC20 since its far more likely to breach armor than the LB20X. This is one of the major reasons why PPCs and AC20s are so good. Because even the slighest damage to your internals by these weapons can destroy items. its a major flaw in the crit system but its unlikely PGI will ever fix it.
Edited by Khobai, 28 May 2014 - 12:47 PM.