Well, it depends (from what I am told). I have a box stock Armalite M15A2 NM and it has about 2400 rounds on its Wilson barrel. Shoots great and the gunsmith says it has plenty of life left. I'm told it matters what type of round were put through it. Mine had a lot of 100 yard 52 gr SMK with WW748 through it and those rounds (if I understand this correctly) aren't as hard on the barrel as lets say my 80 SMK & Varget 600 yard load is.

If my barrel had all XTC loads (77 gr and 80 gr & Varget) it would probably be more worn. I would expect the barrel to die with these rounds at about 3000 rounds.

I would not expect your barrel to be good for another 2000 or 3000 rounds if it already has 2400 through it.