I installed this da only hammer in a Performance Center 586 L comp with a Power Custom trigger. This was not a drop in part in this particular gun. The sear needed material removed from the top rear of the sear for the bottom of the sear to reach the trigger shelf. Bottom and side of sear also benefitted from light stoning. Material was removed from bottom of hammer toe to allow trigger cam point to smoothly engage (to be fair a little material was removed from the trigger as well). Nice that an extended firing pin and spring were included. After fitting it works well and is very smooth. A 5.25 lb trigger pull weight was reached, but put it at 6 lbs for reliability. Over all I'm happy with the results.