I think stippling a Glock does hurt its resale value. Lots of people do this in their garages, and I would have no idea what exactly had been done to the frame. I simply wouldn't buy one that has been stippled. Whether true or not, I have a perception that it weakens the frame, or can cause it to deteriorate faster. When you do this, you are applying enough heat to alter the frame structure, hundreds of times.
I have an older 2-pin Glock 17. While I am not all that accurate with it, I've never felt that the grip is "slippery". But, I suppose if I was going to turn it into a competition gun and fire 50,000+ rounds out of it, I wouldn't worry too much about stippling, as it would be a well worn gun once I'm done with it, and I would have gotten my $500 worth out of it 5 times over. Anything I get for it after that would just be gravy.
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