Frame damage or finish wear is a concern with some of the Pachmayr grips.
I use the Professional Compac on my two S&W Model 66's and the Combat type grip on my Series 80 stainless.
All three have narrow lug-like "lips" spaced around the edges that stick through the rubber and contact the frame, almost like seating pads.
I have to assume these small pads are there by intent.
These narrow pad-like bits of steel do leave small marks on the frames, and I'd be rather leery about using them on a blued gun.
I don't see much of a way that the exposed metal in the above grips could damage the gun unless the grip is loose and moving around, and that area actually contacts the frame.