When I got my no-lock 442 from G&R I had the Apex kit already installed when it arrived. Compared to other j-frames I've owned, with and without the kit, the trigger seemed slow to return. Early on, during live fire and dry fire, there were a few instances where the trigger didn't return requiring me to manually push it forward. It felt as though the trigger return spring wasn't heavy enough. I removed the side plate to investigate and everything looked normal but the gun was dry. I watched the Apex youtube video about the kit again and noticed they suggested to polish the rebound slide. I used some emory cloth and polished the bottom and sides of the slide in conjunction of adding some lube. This had a dramatic effect on the trigger. Not only did it reliably reset/rebound the trigger but the pull was much smoother. I guess maybe some of the internal finish was just rough enough to cause the rebound slide to bind up and the lighter trigger return spring wasnt heavy enough to over come that friction? In any event, since that time I've fired about 450rds and at least 1000 dryfires without the hang up reappearing.