Free: Contests & Raffles.
Almost looks like exfoliation or inter granular corrosion
About the only time I would spend thinking about this would be the amount of time it took me to package it up and ship to Beretta with a note politely asking them to fix it.
My AL391 teknys is doing the same thing. Its a berretta thing. I kinda want to get it re done, but dont know if it would hurt the resale value or not. I never take this one out when there is precipitatikn in the air. Always clean it when after shooting.
Sweaty palms or salty palms causing a reaction with the metal. He should try to send it back or have it cerekoted.