I installed this striker with the included reduced power spring into my custom p365 built with the Custom Shop FCU and did not change anything but the striker. The smooth and shorter trigger pull was immediately noticeable. The polished striker face took the trigger pull from gritty to buttery, and the altered geometry definitely shortened the travel between trigger engagement and the break. The lighter spring took a 1/2 pound off the pull weight as well. Gun functions perfectly with no light primer strikes so far. I plan to order a couple more once they come back into stock.