has anyone else noticed this

Not specifically on that gun, but yes... have noticed the same on multiple guns. Long as it dont 'wear in' past the point of safety.
I know with springers there used to be a saying about a 'one tin tune', meaning shoot a full tin through it to wear it in proper and smooth it all out, burn off any excess oils, etc.

I know much of that wouldnt apply to the Avenger regarding burning off excess but the mating of sears could certainly apply.