Glock mag interchangeability.

[RandyRhoads]

So a glock nut friend and a few other guys and reading said the perk to glocks was that all mags were interchangeable. A 9mm fits in a .40, all series fit other series. Now I'm readin otherwise. Obviously a G23 shorty 10 RND mag can't fit up in a full sized G22. The other way around and it sticks out, cool. Also reading there are problems with compatabity between gens? I bought a gen 4 G23.

Is there some type of chart showing what will and will not it in what gens, calibers, and models?

[teg33]

As far I know, all gen 4 glock magazine will fit to gen 3 glock, however they must be in the same caliber. Gen 3 magazine can not be use on gen 4 glock

[side2side]

As far I know, all gen 4 glock magazine will fit to gen 3 glock, however they must be in the same caliber. Gen 3 magazine can not be use on gen 4 glock

Gen 3 mags can be used on Gen 4 as long as you keep the mag release stock.

[scott_kart]

As far I know, all gen 4 glock magazine will fit to gen 3 glock, however they must be in the same caliber. Gen 3 magazine can not be use on gen 4 glock

Gen 4 Glocks can use gen 3 and earlier magazines, as long as the magazine release has not been reversed on the gun for a left handed shooter.

[RandyRhoads]

Ok cool thanks. So you are saying about havin to be same caliber. I cannot fit a 9mm mag in my G23??? Or was that just in regards to between gen 3-4

[lazyworm]

Another way of putting this... mags for full size (22, 17, 34, 35, 20, 21 etc) can fit in compact (23, 19, 29, 30) as well as subcompact (27, 26) of the same caliber. Mags for compact can fit in subcompact.

[cosmos7]

A 9mm Glock magazine will fit in a .40 Glock. Unless you use a conversion barrel or swap out the top end it's not much use though.

[lazyworm]

Ok cool thanks. So you are saying about havin to be same caliber. I cannot fit a 9mm mag in my G23??? Or was that just in regards to between gen 3-4

a 9mm mag from 17 or 19 can physically fit your 23 frame, but .40S&W ammo will not fit in the 9mm magazine lips nor will it feed properly.

[robcoe]

I think the general rule is as long as it's the same caliber and the same grip length or shorter than the original it works(example, a G19 can take G17 magazines, but a G26 magazine wouldn't work in a G17), .40 and .357 sig are interchangeable(sharing the same parent case), I have heard 9mm and 40 can be swapped back and forth but nothing on whether they function correctly or not.

[RandyRhoads]

Thank you that about sums it up. The length makes sense. Bigger mags fit in smaller frames but smallers can't physically fit into biggers.

And of course a 9mm mag in a .40 frame makes no sense, but it was in regards to my 9mm conversion.

So my concerns seem to be addressed. Part of me hopped I could use 9mm rounds in my .40 cal mags when i convert but oh well. Just need to sets of mags.

[ARDude]

I have been using a 40-9 conversion barrel in a Gen 3 for awhile now. I use Gen 3 mags and Gen 4 mags with no problems. So far 100% reliable. If I use 9mm ammo in a 40 cal mag it is not 100% reliable.

[RandyRhoads]

But they will fit? My gun is .40. That is what I wanted. But I had to I could likely get 9s in my .40 mags and quickly swap barrels? Just wouldn't be as effective?

Kind of stupid. The term "shtf" carries less and less weight with me the more in think about it but for S&Gs I still have that mentality of "could I" in that situation.

[ARDude]

Yes, 9mm ammo will fit in a 40 cal mag. But you will get some ftf or fte. Just make sure you dont shoot 9mm thru a 40 barrel!

[ARDude]

Also, you can not just swap glock 9mm and 40 barrels. It has to be a conversion barrel.

[RandyRhoads]

Hmm. Quick elaboration please? It's still a simple barrel and ejector swap, just a specific barrel for converting right? Indont need extra converting and barrel parts right? You're just saying infant buy a stock glock 9 barrel and throw it in.