Sometime in the last year or so Daniel Defense adopted salt bath nitriding for something relating to their barrels. Looking at the 18" S2W barrel linked below, the DD website indicates that the exterior finish is nitride treatment while the bore is apparently chrome lined. Is that correct? I'm asking just because other manufacturers that adopted nitride treatment for anything used it both inside and out, and I thought I read somewhere that these barrels were purely nitride treated, no longer chrome lined.

https://danieldefense.com/cold-hamme...-stripped.html

Thanks in advance.