Differences in Glock generations

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I often hear Glocks being reffered to as part of a first, second or third generation. I'm wondering what exactly this means. I'm assuming that a second generation is an improvement on the first, and the same for the third as compared to the second. Design modifications?
 
Here's the basics of it. I'm sure there are other technical differences but here's the easy visual differences.

First generation guns had a smooth grip.
Second generation added checkering to the front strap.
Third added the finger grooves, thumb rests on the side and the accessory rail on the dustcover.
 
3 gens of Glock frames:

glockframesao0.jpg
 
It is more than just the finger grooves and acc. rails.

Keep googling...there are 2 pin and 3 pin frames....the inners are not all alike..

There is also a Glock 3.5
 
It is more than just the finger grooves and acc. rails.

Keep googling...there are 2 pin and 3 pin frames....the inners are not all alike..

There is also a Glock 3.5

+1 There are 2 and 3 pins frame in 3rd gen. And i have seen 2.5 generation too. This one have the finger groove on the grip but no accessory rail.
 
another ? for you glock gurus.
the model 21 and 21 sf,whats the diff?
i assume the sf stands for small frame or slim frame?
thanks in advance.
 
another ? for you glock gurus.
the model 21 and 21 sf,whats the diff?
i assume the sf stands for small frame or slim frame?
thanks in advance.

SF stand for slim frame. It's the same gun with a slimmer grip, a picatinny rail and an ambidextrous magazine release.

glock21slim.jpg
 
I believe SF stands for "short frame." I don't think the grip is actually slimmer (flatter) but rather the grip reach has been reduced.

There are what Glock calls "slimline" which I believe is the G36. That is a sub-compact .45 w/ a single stack.
 
I believe SF stands for "short frame." I don't think the grip is actually slimmer (flatter) but rather the grip reach has been reduced.

There are what Glock calls "slimline" which I believe is the G36. That is a sub-compact .45 w/ a single stack.

You are correct on the G36, this one is a slim sub-compact pistol. But the 21SF is really a slim frame .45auto full size pistol.

Quote from an other gun site:
'' The Glock 21SF was originally developed and designed to compete in the currently cancelled US Military Trials that were seeking a .45 ACP pistol to replace the current Beretta M9. The first Glock 21SF's developed and designed for the military included popular revisions such as the picatinny rail system (which replaces the common 1913 rail system on most other Glock pistols) and the ambidextrous magazine release, along with the well designed frame reduction designed to ensure that the grip is more universal. The Glock 21 grip reduction extracted material mainly from the backstrap of the grip. ''
 
thanks for the replies.i held a glock 21 in my hands but it was way too wide for my small hands...

I'm thinking I might be in the same boat, not that I have especially small hands but when firing a friends G34 the grip didn't feel as comfortable as does my father's S&W22. Of course it's only a .22lr so there is no need to fit a double stacked mag in the grip but I think a single stack might fit me best. Does Glock offer this in any of it's models which I'm unaware of?
 
2Pin->3Pin, added chamber indicator (the extractor), finger grooves with checkering, tactical rail, better finish, sights.
 
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