Question.
I have a Competition kit. If I install it on one of my pistols, will using the stock trigger return spring give a lighter or heavier trigger pull than using the Competition TRS?
It depends upon the set up you are using. Are you running our forward set? If so, you would need to use the sear spring provided in the FSS kit, and not the comp sear spring. If this is the case, trigger pull would be about 4 lbs give or take a half pound.
If you are using the factory trigger as if competing in USPSA Production division (or SSP in IDPA) and the comp sear spring, the low to mid 3 lb range is common. Hope this helps!