Nula
I have two of them, one sporter, one 10.5 gun, the sporter only has about 1500 hundred rounds through it, I just built it last year, the 10.5 has about 25 thousand rounds through it and I don't see any wear on it yet. Just recently I did have it BN plated to match the stainless barrel so now it's really hard. I have had to replace the firing pin spring after about 15000 rounds as it took a set but so far that's it. I prefer the ULA to my Anschutz as it is easier to cycle. As for doing well with them that's more shooter than gun LOL. Mine will shoot 250's when I don't screw up, this weekend I had a 250 17 and a 250 19, can't complain about that. They use to be a real steal, I paid 420.00 for my first action but Melvin has come to his senses since then.
Dennis