They'll run well beyond 1500 rounds, that's no problem.
I didn't say they were made of eggshells.
If you start out with timing issues already present, you're buying a gun that's already a good ways into its lifespan. That hand can only go in one direction with more use- short. It can't grow while you continue to shoot it. Why not look for one that doesn't already have a substantial part of its service life used up?
My first one bought new is still in time & it's 30 years old. I just don't shoot it much.