That isn't a lot of shooting but your habits are not specified. Do you clean the contact points after each session and put clean gun grease on critical areas each time? Do you just close the gun or do you like to feel it snap closed? Do you open the gun softly, snap it open or drop the barrels using their weight to snap it open? In 40,000 rounds gun care and handling habits can be a lot more significant to wear than actual firing.