The original finish on my Ruger 10/22 hammer forged barrel was not at all tolerant of moisture. I discovered this the hard way after one Boomershoot when I closed it up in the slightly damp case for a couple of days. I cringed every time I looked at it. I kept telling myself and others that saw the damaged barrel, “I need to get the barrel refinished but I just haven’t got around to it yet.” This went on for several years and I finally got around to it this year.
I sent the barrel to Robar to get their NP3 finish on it. I really liked the NP3 finish on my STI Eagle and figured it would be good for the 10/22 barrel as well.
Except for the pitted surface irregularities it looks good:
I still need to sight it in and see if the accuracy changed any.