Probably between 8 and 10 K rounds and the only problem I had was a broken firing pin. They sent out a new bolt and carrier within a few days. Even with the broken firing pin it still shot but I happened to catch it while cleaning the gun.
I've never had anything loosen and I haven't loctited anything. I do make a habit of checking things every other range day or so and even doing that it still takes less time to clean than any other gun. I look at it like preventive maintenance on the car--changing the oil, checking the lugs, rotating tires, etc.
It is my go to gun and has been for two plus years now.