Does armor pierce work?

Started by Chib
Eb306d5db542177abc16eac75f6c085b?s=128&d=mm

Chib

I have armor pierce 1 and 2 currently. Maybe i am wrong but i do not notice a difference in damage. It does make the little pink poofs at the start of the round when triggered. Is it suppost to last the whole round? Or trigger multiple times a round? Thanks