Brand New 629...90 Rounds Results in cylinder damage/galling.

Several years ago, i purchased a new 627-2 and it also showed peening around all the cylinder stop notches in short order, causing a slight hitch in the double action pull. A machinist suggested I just peen the metal back into the cylinder. I have shot many thousands of .38 special rounds through it since, and I have only had to peen it one more time, and then only very lightly. It may be self correcting, like the flame cutting on the topstrap.
 
I looked at photos real quick on my phone - looks like it starting to develop a normal turn line - nothing to get worried about - oil it up and forget about it.
 
I've looked again - noticed the peening - a friend of mine has a couple of stainless smiths they all look much worse then yours and I always wondered why - untill we where shooting one day, we were no more then 8' apart and I was shooting a ported 445 supermag , I had plugs and muffs on and while I was looking at primers of the rounds I just shot I could hear this sniking sound - it was my buddy thumb cocking his gun - now I only let him shoot my rugers - I would still oil it up and forget about it - by the way those grips look great - hope this helps
 
I've looked again - noticed the peening - a friend of mine has a couple of stainless smiths they all look much worse then yours and I always wondered why - untill we where shooting one day, we were no more then 8' apart and I was shooting a ported 445 supermag , I had plugs and muffs on and while I was looking at primers of the rounds I just shot I could hear this sniking sound - it was my buddy thumb cocking his gun - now I only let him shoot my rugers - I would still oil it up and forget about it - by the way those grips look great - hope this helps

Thanks alot, I really enjoy these grips.

I'm not sure I follow the 'thumb cocking'?
 
Note the cylinder stop is a MIM part, showing an uneven surface from the molds not being aligned perfectly .... causing the contact point to be only partial and the added psi pressure on the partially contacted surface in the cylinder notches showing the resulting pattern of uneven contact at each cylinder.
 

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