Thanks for the info.
I think (cannot be really sure about it) that the "damage" occurred in a concitate shootout. For some reason my Mag (an aftermarket, not a TM one) was near to the end of gas. The blowback "force" was not able to reload the hammer correctly and the knocker stuck releasing all the gas at once. Maybe it got freezed up and the next mag (yes, may be rammed a little more due to situation) broke it IMHO.
Thanks , I iwill sand it. Glad to know it is not an essential part
May i ask you what's the best type of lube I can use on the slide?