Why was derringers nerfed?

[BaneOfGiygas]

Actually, this is probably a good time to bring something up: How does armor-piercing bullets work? Do they just flat-out ignore all armor whatsoever, or is there a sort of "armor penetration rating" which is just jacked up to extreme levels with armor-piercing rounds? The latter system, while more complicated, seems like a better idea, especially with the new materials system looming in the distance. While armor-piercing rounds should definitely negate a significant portion of the defenses that armor gives, having it register heavy armor made out of the strongest alloys known to mankind as being on the same terms as general-distribution armor sets is a questionable decision. Maybe it's a balancing thing that I'm not recognizing, but I dunno, just my thoughts.