What kind of guns? A revolver is not the same as a 1911 which is not the same as a Garand which is not the same as a hunting rifle which is not the same as a 22 which is not the same as a shotgun.
Dry firing thousands of times smooths up any trigger anyway. At little expense.
I have a few different guns that need some TLC. (opening post) ^^^ 1 shotgun (slug gun) 2 polymer semi's and 2 bolt guns.