You got it. The recoil pad held a little moisture inside, and it ruined the finish.Slip-on recoil pad left on?
Yup and many of the old pads deteriorated and got sticky messing with the finish. Saw it many times over the years at gun shops I've frequented for 30+ years. Rule of thumb. Don't leave a slip on pad long term.Slip-on recoil pad left on?