I have a DD Mk12 that came with their whoop-de-doo CHF nitrided barrel. My bull barreled Armalite easily outshoots it.
All of mine have been buttoned stainless barrels and so were Norm's Lilja barrels. The nitride has never hurt anything because the barrels were chambered well so there wasn't any real issue with break-in. To me the biggest thing was it didn't warrant the expense because it did not significantly improve barrel life. My nitrided guns require less maintenance in the fields in that they clean up easier and seem to resist rust a little better. If a gun comes with nitrided parts that is fine but I am not going to go out of my way to nitride one, especially if it is a stainless barrel or rifle action.
