A friend picked up one of these the other day as his first gun. He got it due to the uptick in people acting stupid regarding he and his family being Chinese, owning the local take out place, giving them shit about the Corona Virus, etc.  This is in a suburb of Philadelphia and he getting his CCW there.

But the question is, can the Gen 5 use the earlier Generation magazines? I have 4 I'd send him, but they only have the notch for the magazine catch on the left side as you are looking at the front of the magazine, and a patch of bare metal above it. Sorry for the ignorance, but I can't keep up with Glock and their changes.

I don't want to send off something that is useless.

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Original Post

All of my GEN 4 mags work in my G45.  GEN 3 and 4 mags are forward compatible, but you can't switch the mag release to lefty.  Gen 5 mags are not backward compatible, if I'm correct, though.

What PlasticMag said. You just need to swap out the floorplates with the little extended lip. Somewhere in the basement I have a a bunch of Vickers baseplates that I need to swap any gen 5 G17 mags that have the weird lip. (I run a 19X as my everyday Glock, though, and the lipped baseplates do NOT work with those.

So... to be clear for the OP (and me): Earlier Gen mags  can be used in a Gen 5 gun as long as the ambi-mag release isn’t switched to the right side of the gun (left handed shooter)?

I've been considering updating pistols (Gen3 to Gen5 G19s).  I had the same question about compatibility, so a couple of weeks back I stopped in at the LGS.  Plug and play tested Gen3 G17 and G19  magazines and PMags, in both a Gen5 G19, then in a Gen3 G19.  All inserted, locked and dropped free.  I would agree that the shorter floorplate would be a better fit if you're using the Gen5 magazines in an older pistol however using legacy magazines in a Gen 5 pistol you should be GTG.

Interestingly, we had a couple of G17 Gen5 guns at a Glock Range Day we ran a couple of years ago.

They would not run reliably with the G17 Gen4 mags we had on the line at the same time. Switched back to the Gen5 mags, and they ran like tops.

I recall that the guns wouldn't go into battery after the first and subsequent rounds.

Small sample, but still.

Regards.

Mark

@Community Member posted:

Interestingly, we had a couple of G17 Gen5 guns at a Glock Range Day we ran a couple of years ago.

They would not run reliably with the G17 Gen4 mags we had on the line at the same time. Switched back to the Gen5 mags, and they ran like tops.

That's strange, I'm not sure why that would happen. I haven't tested my Gen 5 with older magazines yet, but I'll have to give it a try.

All Glock magazine generations should be compatible with all generations of Glock pistols, as long as you're right handed, with the exception of the Glock 19X, which has the small lip at the front of the magwell that prevents it from accepting Glock Gen 5 baseplates. As always, test them at the range to make sure they work in any pistol you plan to use them in.

There were two generations of ambidextrous Glock magazines prior to the release of the Gen 5. The first one is easy to identify because the silver metal liner is visible in a rectangular "window" in the front of the magazine (for the rare Glock ambi mag release) and the left side notch for the left-handed mag catch. You can see that version in the second photo here:

Have You Ever Wondered Why Some Glock Mags Have A Silver Rectangle?

The last generation before the Gen 5 had plastic notches on both sides and no metal liner visible. The mag body looks just like a Gen 5 mag but it has a black follower and standard baseplate. It's usually labeled as a Gen 4 magazine, despite the link above also calling the previous version a Gen 4.

The Gen 5 extended baseplate works fine in earlier pistol generations. There's no reason to change it out unless it bothers you for some reason. It extends out so it's flush with the front edge of the magwell on my Gen 3s. In fact, I bought a few FDE Gen 5 magazines to use in my FDE Gen 3 G19, you know, just so the colors match...

Last edited by Community Member

The weird lip on the 19X is the reason I decided to try out the Vickers baseplates from TangoDown.  I find those a worthwhile update for any Glock mag, enough that all my G17 mags now have them, and my G31 and G32 mags will soon. Eventually, I'll probably do the same with the G20 mags.

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