I think trigger practice is great, but I don't think dry-firing does a gun any good no matter what anyone says. Hit something enough times and something is going to break, period. Examples - Chinese water torture, the Grand Canyon, the Liberty Bell, any Alcatraz escape. See if your wife will let you smack her diamond engagement ring a few thousand times with a tack hammer. And the snap caps I've used look like the firing pin has poked deep into the plastic or composite or whatever it is at the primer position after a few dozen snaps. Anybody have any other techniques? I've used pencils, but I don't think the erasers have much slow-down properties. Phone book? Won't fit. Firing pins are $50 and if you crack the breech face, yikes. Time for a new slide. Or a new gun. Anyone invented a rubber/practice firing pin?