For those who are wondering just how much our CHF Nitrided barrels can handle. I would like to ask those of you who have the 51k's with our barrels in them to keep track in some informal manner of the number of rounds shot through them. This paticular set up is probably the most abusive on the throat area. Maybe a beta mag test or 2 in a row with a sear. I think it might get a little hot.