I know many people complain about the grips of Glock pistols. Particularly the gen 3's and before. Their slick grips have even spawned a niche aftermarket for add on grips. I tried a few of those, but ultimately decided to go a more permanent route by texturing my G19's grips with a run of the mill soldering iron. Here's how it turned out.
I'm sending this from my iPhone so hopefully it works.