Besides beefing up the frame with a third pin, when Glock introduced their 3rd generation pistols, (the Gen3), they made an attempt to add finger grooves on the grip. This wasn’t the normal flowing finger grooves of a Smith & Wesson grip, these were raised notches with a rough grip surface in between.
On the full size guns (G17, G20, G21, G22, etc.) these grooves seemed to line up okay with my fingers. But, for some reason, Glock decided that whoever bought the smaller midsize and compact framed pistols must have smaller hands, so the finger grooves were made closer together.
Ever since I got my Glock 19, Liberty, I’ve lived with this design oversight, but, truth be told, it made my hands hurt after shooting a few magazines through it. After a while, I decided to slip a rubber Hogue grip over the G19 finger grooves, and that gave a little relief, but it didn’t solve the problem.
Some people suggested removing the finger grooves, but I was reluctant to deface the G19 frame that much, in the even that I decided to sell it some time. But, I also reasoned that someone who was buying it might actually appreciate a gun that fit their hand.
So, without much further ado, I decided to use a sanding drum on my Dremel tool to zip those finger grooves down flush. I hand finished the job with some 300 grit paper, and smoothed it all with some Armor-All. I then slipped on the old Hogue grip, to index my fingers like they are on my G17, Bruce.
The verdict? I just wish I hadn’t waited so long.
The project in pictures:

I’m with you on being reluctant in permanently modifying something like the frame but many have done so with Glock and are in heaven. It does seem like you are doing the equivalent to ripping pages out of the bible when you permanently modify something like that, but if it gives the advantage you are looking for then you gotta go for it!
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I see the point of your analogy. But, in this case, if it’s a Bible, I’m ripping out those pages in the middle where you record marriages and deaths. They serve no use any more.
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