Glock upper compatibility

[Paul053]

Hi folks I've been getting some vague information about this so I thought I'd ask the experts. I've read that there is a certain amount of interchangeability in the Glock line. For example if I own a G34 I can buy a G17 upper and slap that one no problem because they are both 9mm slides.

But what about caliber differences? Can I buy a G20 upper (10mm) and slap that on my fullsize (non SF) G21 (.45) frame with no modification?

Or buy a .40 cal upper and put that on my G34 frame with no modification?

And from a legal stand point are there issues if the barrel's serial number doesn't match the frame?

[tal3nt]

Serial numbers don't need to match. Legally speaking, the grip frame is the gun, the rest are just gun parts. I've never converted my Glock, but to my understanding as long as the slide comes from another Glock with the same sized grip frame, it'll fit all compatible Glocks. You'll also need the correct barrel. When converting from a larger to smaller caliber such as 40 to 9, I believe all that you need in most cases is a conversion barrel. I do not think you can convert a 9 into a 40 however using only a barrel, you would have to replace the entire upper as you mention. Also, I think you need the correct caliber magazines.

[paul0660]

I am not sure about Glocks, but CZ uppers are interchangeable and most .40 or 9mm mags will fit the other caliber. Sometimes the lips need to be futzed with. (and they can hold odd amounts of rounds).

Slides, even with serials, are not registered, and can be sent in the mail if you wish. De frame is de thing you have to keep track of. That is why .22 conversions are simply parts and sent that way.

[HighLander51]

Here is the Glock stack.

Small frame (G17/G22/G31) are all the same frame and can interchange with each other plus G34/G17L/G35 and G24 uppers.

Compact frame (G19/G23/G32) interchange with each other.

(G30/G29) with each other

Subcompact (G26/G27/G33) with each other

Large frame (G20/G21) with each other

G36 is by itself.

The magazine has to be of the correct caliber, and a G22 upper may run on a G17 without changing the extractor and ejector. G22's and G31's use the same extractor and ejector. 10mm and .45acp have different ejectors and extactors.

[Chaos47]

Its a blanket statement that slides are never the registered part and that frames always are.

In this case yes the GLOCK frame is the registered part. But that is not always the case, take the Ruger MK series for example the frame is not the registered part, the upper half the receiver (barrel and "slide") is the registered part.

[munkeeboi]

I'll let you know. I just bought a complete G22 slide for use on my G34. First thing i was told to watch out for is that if you are switching from 9mm to anything larger, make sure it is a 3 pin frame.

In my case, I was also told to upgrade the .40 cal trigger housing (holds ejector, $8 part) since it would work with both .40 and 9mm, and that the standard 9mm trigger housing would not work for both calibers.

i'll find out soon enough, It will not be my HD gun so i'm not too worried about it.

[HighLander51]

I'll let you know. I just bought a complete G22 slide for use on my G34. First thing i was told to watch out for is that if you are switching from 9mm to anything larger, make sure it is a 3 pin frame.

In my case, I was also told to upgrade the .40 cal trigger housing (holds ejector, $8 part) since it would work with both .40 and 9mm, and that the standard 9mm trigger housing would not work for both calibers.

i'll find out soon enough, It will not be my HD gun so i'm not too worried about it.

The original G22's were all 2 pin frames, and later switched to a 2 pin locking block. Unless you plan to shoot 40,000 rounds thru it, no worries. Sometimes a 40S&W will run on top of a 9mm, and vice versa, but to be sure change both the ejector and extractor.

[sirgiles]

It is asked often and many folks get the wrong information, so we are going to show the Glock owner and the generally curious all of the possible Upper/Receiver combinations in the Glock. In other words which uppers work on which receivers.
* Indicates ejector and mag change.

Receiver------------Upper/s
G17.....................G17,17L,34
G17L...................G17,17L,34
G19.....................G19
G20.....................G20,G21
G21.....................G20,21
G22.....................G17*,17L*,22,24,31,34*,35
G23.....................G19*,23,32
G24.....................G17*,17L*,22,24,31,34*,35
G26.....................G26,27*,33*
G27.....................G26*,27,33
G29.....................G29,30*
G30.....................G29*,G30
G31.....................G17*,17L*,22,24,31,34*,35
G32.....................G19*,23,32
G33.....................G26*,27,33
G34.....................G17,17L,34
G35.....................G17*,17L*,22,24,31,34*,35

http://www.glockmeister.com/GlockUpperSwapsbyModel.asp

[galabomber]

That was a plus for me, Glocks compatibility with the full size frames. I was interested in the long slides, but they were a PITA to get. So I bought the uppers only. Not to thread jack, but I have one G17L upper for sale if interested.

http://www.calguns.net/calgunforum/showthread.php?t=592161

[Paul053]

It is asked often and many folks get the wrong information, so we are going to show the Glock owner and the generally curious all of the possible Upper/Receiver combinations in the Glock. In other words which uppers work on which receivers.
* Indicates ejector and mag change.

Receiver------------Upper/s
G17.....................G17,17L,34
G17L...................G17,17L,34
G19.....................G19
G20.....................G20,G21
G21.....................G20,21
G22.....................G17*,17L*,22,24,31,34*,35
G23.....................G19*,23,32
G24.....................G17*,17L*,22,24,31,34*,35
G26.....................G26,27*,33*
G27.....................G26*,27,33
G29.....................G29,30*
G30.....................G29*,G30
G31.....................G17*,17L*,22,24,31,34*,35
G32.....................G19*,23,32
G33.....................G26*,27,33
G34.....................G17,17L,34
G35.....................G17*,17L*,22,24,31,34*,35

http://www.glockmeister.com/GlockUpperSwapsbyModel.asp

Thanks man this is exactly what I needed!

[HighLander51]

Thanks man this is exactly what I needed!

I already said that, he just lined it out by model number, but I forgot the G18(G17 frame) and G25(G19 frame), G28 (G26 frame), G37(G21 frame), G38(G38) and G39(G39), if you wanted to change those around.

[Paul053]

I already said that, he just lined it out by model number, but I forgot the G18(G17 frame) and G25(G19 frame), G28 (G26 frame), G37(G21 frame), G38(G38) and G39(G39), if you wanted to change those around.

Thanks to you too!