Glock mags

[P5Ret]

I'm sure this has been asked and answered before, but my search fu is failing me today. How reliable is using 9mm in 40 S&W Glock mags? Am I better off buying mags to go with the new barrel?

[003]

Won't work - - .40 Cal magazines have a wider opening than 9mm. 35 caliber vs 40 caliber. You will need to use the proper magazine.

[daybreak]

of course you're better off buying new mags to go with the new barrel. I've heard you can use .40 mags, but Would I bet my life on it? Nope.

[MrExel17]

what they said^^^

[sffred]

I believe CZ's 9mm and .40 share the same mag, but not glock. Glock .40 mags is the same as .357sig mags(basically .357sig is a necked down'd version of a .40s&w case)

[Grumpyoldretiredcop]

Loading 9MM rounds in a .40 Glock magazine results in the rounds popping through the feed lips under the pressure of the follower spring. You'll need 9MM magazines.

[P5Ret]

So basically what I have heard people say about using 40 mags in a 9 to get an extra round or two out of 10 round mags is coming out of the south end of a north bound bovine. That's kind of what I figured. I can put 9's in the mag but I have no way to function test it. I have seen the result of 40's in a USP45 mag, it was kind of humorous to watch the round fall out of the barrel when he switched mags on the line.

[daybreak]

I believe CZ's 9mm and .40 share the same mag, but not glock. Glock .40 mags is the same as .357sig mags(basically .357sig is a necked down'd version of a .40s&w case)

From what I understand, the mecgar anti friction mags in .40 and 9mm are the exact same, minus the witness marks.