What ever part isn't Operating…attempt everything with stock OEM parts. Sometimes aftermarket slides and triggers have as well restricted tolerances to work in the P80. Thus far the Brownells and Grey Ghost (a little limited) have worked in my builds. I’ve read ZEV slides could possibly be too restricted. Polymer80 https://socialeweb.com/story4001741/glock-43-p80-things-to-know-before-you-buy