Depends on how you shoot it. You sit on a p dog town with it and say goodbye. You use it for hunting deer, elk, coyotes etc then it will be alot more. I would say that it will last the normal long range guy 2-3yrs. Just depends on how good you take care of it and how many rounds you shoot a year.
I dont know who ever came up with the imaganary word of "Over Gunned"