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Glock 9mm Conversion Experiment

2210 Views 14 Replies 12 Participants Last post by  mascott
I've got several .40 cal Glocks that I picked up cheap at Southern Connection. All except for one have been converted to 9mm with Lone Wolf .40-9mm conversion barrels. Drop in a barrel and add a 9mm magazine and it's ready to go. I read online that in a pinch you could just use the .40 magazines. I decided to try that with the latest one I picked up, a Gen 4 G23.
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I loaded up a couple of mags to see how the 9mm fit in the .40 mag. The feed lip appear to barely hold the 9mm. The round sit a lot higher. I was concerned that the spring pressure from a full mag would force them out but it never happened. I ran over 50 rounds through it had never had a single issue. I would have guessed that it would have jammed with them sitting that high but it never happened.
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I've unknowingly done that at the range before. Was reloading a mag at the bench then realized was a 40 mag. It was a factory Glock mag as well. Curious if aftermarket mags Do the same. I think for range use it's perfectly fine, I would not in any circumstance carry or recommend using the wrong mag for carry/self defense
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I shot my .40 Glock the same way. No problems at all. Got a .357 Sig barrel but never used it. Wonder which mag is the best for that round ??
If not mistaken the S&W m&p 40s&w mags also have 357sig imprinted on them. So I'd say the same for Glock mags
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