A LGS has them for 1/2 the price of Glock brand magazines. I could use a few more G17 and G19 magazines.

Since the previous thread was from January, I will add this:
I have three for a G17. No problems. I would guess about 500 rounds with them. May buy some more and hope they expand the caliber choices.

I've got some 140mm's in bound to test out..

I love the 21's.

I really like them, did not find out about them until late last year...as we got closer to the election last year, I purchased a bunch of them. Since then I started using them more and more. The Glock OEM mags went into storage. Now use the Magpul exclusively for range work.

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Thanks for the input. Sorry I missed the other thread.

I've been using the mag pul and the ETS mags for a few years with no problems at all and many thousands of rounds.
I'm confident that they work and use them interchangeably with Glock mags without giving them a second thought.

Work perfectly fine for me.

I dry fired with mine last night, they feel sturdier than the ETS mags I have. I wont be able to shoot them until this weekend, but I expect them to work like everything else Magpul makes...

I've got about 20 of them and they have been 100% reliable.

No problemos with mine other than the springs are rather ornery when new. Getting 'blackjack' into a 21 rounder was near impossible without my Uplula. Even with a few hundred rounds through each it remains a struggle without the benefit of using a loader. But that can be said of factory magazines as well.

No issues at all with the few I have for my G17 and 19. I actually kind of prefer them.

Mine have been great. Have a number of both the G17 and G19 models. A few thousand rounds between them. Only complaint is about the G19 model because of the huge baseplate. Makes the gun pretty close in height to a G17, at which point, why not just use the G17 mags and get 2 more rounds? I just hate overly large baseplates unless they're giving me more capacity lol

I still think they are good to go. I like the 21 rounders. The price is great. They are reliable. You can buy two of the 21 rounders for what a single +4 or +5 mag extension to add to a 17 rounder costs.

I have a few for my G19s, they work great.

I was shooting this winter with Magpul and ETS, the ETS followers stuck in the cold, the Magpul mags kept running.

I've had a few that I've put a lot of rounds through; several thousand so far. The one to talk to about the magpul is Jerry Jones, on this site. He's done a lot of testing and research with them for his department, and in the classes he teaches. he spoke highly of them.

I put them in the rotation on my belt and didn't take time to differentiate them from Glock factory magazines; they all performed the same with no notable difference.

I'm inclined to carry Glock magazines, but have no issues training with the magpuls.

Heck, Just about the only thing I can think of that would be a deterrent would be that the Kriss Vector magazine extensions won't fit any of the the Magpul magazines. Other than that... ?