Intermittent heavy glock trigger
I have a Gen4 G23 that is stock internally except for a polish job (done with a dremel and felt wheel/semi chrome) and a LW conversion barrel. I've been dry firing it and it felt great, best stock glock trigger I've felt. I took it out today and after about 50 rounds it turned into a about a 15 pound pull. After I field stripped it and tried to figure out what happened, I put it back together and it was fine. A few more rounds and the pull was heavy again. I haven't had time to take it totally apart yet, but what should I look for?
Ammo was freedom munitions 124 gr, which I don't find to be dirty, ran fine in my g19.