Hi:
I have attempted to add to my knowledge by asking this question on the "Glock Talk" Forum with negative results. I have the opinion that if any firearm knowledge is unknown on this Forum, then the knowledge does not exist.
My question:
What is the differences/improvements between the first, second, third, and fourth generations Glocks?
Thank you,
Jimmy

A quick survey:

1st Gen - Smooth grip, no rail
2nd Gen - More gripping surfaces on grip, no rail
3rd Gen - Finger grooves in grip, rail
4th Gen - Rough Texture Finish (RTF) grip, rail

What cmort said.

Glock 1st, 2nd, 3rd, 4th generation differences - BayouShooter.com Forums

here the first three gens are showed side by side

Im not sure about internal differences

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- The Federalist #46 -

There are also some pistols that are referred to generation 2.5. They either have the finger grooves and no rail, or no finger grooves and a rail. I don't remember which. And, the frames have been changed to a 3 pin from a 2 pin and the generation 4 pistols have interchangeable back straps.

Thank you fellow Forum Members,
I appreciate your help and information.
Jimmy

Also, the Generation 4 pistols can be broken down for cleaning without having to pull the trigger on a closed chamber. There have been several accidental discharges with earlier Glocks, since you can't remove the slide without first pulling the trigger.

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NRA Life Member

RTFs are not Gen 4, they were a Gen 3 revision prior to the Gen 4 release.

The Gen 4s are out and have adjustable backstraps similar to the M&P.

There may be other subtle differences and I'm by no means an expert I'm just sayin'.

Yes, any heavily-used Glock, of any generation or caliber, is worth $350 any day of the week. You may have to replace a trigger spring or something cheap, and then you're good for another 20,000 rounds.
I love my Smiths; I love my Rugers; I respect my Glocks...all of them.
Sonny