I went to the range today to shoot my new CZ P10c, acquired just yesterday.
I have a Glock 22 in which I sometimes use a drop-in Lone Wolf barrel in 9mm.
A comparison of the two was my intent so I loaded them both with 9mm Fiocchi and began with the Glock. First shot and the round failed to fully eject, which is highly unusual. When I looked at the casing I knew why. Although I thought I had installed the 9mm barrel, I had not. The 40S&W was installed.
I feel quite fortunate and embarrassed at the same time.
Thank the lord for Glock strength and flexible brass. It fed from a 40S&W magazine, shot from a 40S&W barrel and almost ejected the case. I'm glad it didn't.
In over 40 years of shooting and at least 35 years of reloading this was my first mistake of this kind. I won't make it again.
I wasn't sure if this should go in the 'Others' forum or here, so...

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" I don't recall, senator."

Does this mean if I buy an 9mm barrel for my .40 Glock I will not have to buy additional magazines in 9mm?

It happened to me once but with a .40 in my .45 SIG P220.

My bud loaded some .45’s for me and apparently let a .40 fall in the box. It had to be stupid me that loaded the magazine. 100 degree day at a the range.

IIRC the pistol did fire but stove piped on extraction.

Pecked out on my iPhone.

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Death? Smile back...

Okay, good on you for finding and reporting on your disappointing moment.

Here's the good news: Yes, it's always a -BAD- idea when anyone puts the wrong ammo in to a firearm, but your mistake wasn't all that "dangerous" per se.

The cartridge needs the restriction of the bullet in the bore to develop and reach it's proper pressure. Without that needed resistance, it got nowhere near it's peak and proper pressure.

The 9mm bullet popped out of there more like a very spicy champagne cork than a true 35,000 PSI 9mm bullet.

Running 9mm ammo in a Glock .40cal magazine is likely to work most of the time. However, if you want to use the gun for any manner of defense or any competition where a failure is not acceptable, you'd be foolish to not pick up some Glock or Glock-compatible 9mm magazines... of which there are literally a guzillion available.

Magpul is even making 9mm Glock magazines these days and given Magpul's reputation for success, I would not hesitate to try them.

Given the market and availability of Glock 9mm magazines, it's penny wise and pound foolish to not buy 9mm magazines to go along with a 9mm barrel for your .40 caliber Glock.

I always try to have only one type of ammunition and gun out at a time on the bench. I am OK with dissimilar types. Say a 38 special and 9mm since there is no way you are going to mistake one for the other. 9 and 40 on the bench is a no no. 380 and 9 is bad too.

I have both a 9mm and a 357 Sig barrels for a Glock 35. using 40 mags and stock extractor springs ect , in maby 10, 000 rounds of 9mm and hundreds of 357 Sig I have never had a problem. Also 380 Auto will feed from the 40 mag and fire, but it will not eject.

I always get the tacky LW logo in shiny stainless on the conversion barrel, just to give me a reference from the black Glock factory barrel. Just dab paint/tape or nail polish on the 40 mag for another visual.

Be safe out there

I’d classify that under: not a big deal.

I’ve seen it happen more than few times during qualifications. The gun always ejected, fed the next round, and generally hit the target. Usually the shooter noticed something was off, but I’d bet it happened quite a few times and wasn’t noticed.

We would dump ammo in .50 cal cans from the boxes and guys would load from the cans. Cut down on "take home" ammo. There were always a few rounds that got cross contaminated between the .40s and 9s.

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“What you got, ain’t new.”

Happened to a friend who owned both an M19 and an M23. Had them both apart for cleaning and swapped the barrels. We were not as quick to figure out the problem, as the 9s would feed and eject from the .40 barrel. My excuse is that I didn't know he had M23.

This happened to me once with a 3006 rifle. I must have had a
270 cartridge in my coat pocket from year before. Anyway got
on stand and loaded the rifle at dawn. A half hour later a buck
came down the creek and stopped broad side at less than 100
yards. When I squeezed off got a wierd hollow thiok instead of
a bang. Buck went to parts unknown, bullet hit in leaves 20'
from me. Case was dirty but didn't hurt rifle and fire formed
case to 3006. In fact it did a poor job of that.

I had to educate a guy at the range trying to shoot 380 ammo out of his 38 revolver. He couldn’t figure out why it wouldn’t fire.

There is always an outlier...

When I was still working full-time+ I took several guns to the range every Saturday to do lots of testing. I managed to fire a very Major 38 Super load in my 45 Auto. The brass blew out and formed to 45 dimensions with a distinct empty space all the way to headstamp. I kept that on my loading bench for years.

Anybody here ever fire a hot 38 Super handload under a roof w/o hearing protection?

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Bob.
SWCA 1821

I keep all my 1911 magazines in plastic (tupperware type) boxes marked with a black permanent marker as to which they are (8 round .45, 7 round .45 and 9mm).

I once took my Kimber 9mm 1911 out of the safe in poor light (both it and my .45 Springfield are stainless and wear the same grey grip panels) when I wanted the Springfield. When I got to the range I loaded my 8 round .45 mags and went to charge the pistol. Thankfully it wouldn't chamber.

Since then I always visually inspect the pistol as I remove it from the safe.

And I once saw a .223 round inserted backwards into an M4 magazine. Surprisingly it fed but jammed the action up solid.

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View from down under

If you want to shoot a different caliber, buy a different pistol . . .

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Wisdom comes thru fear . . .

I witnessed a .41 magnum round accidentally fired in a TC .44 Magnum. It didn't hit anything but it didn't hurt the gun or shooter either.

This is a case where the "just say no" strategy would be effective, IMV.

No offense to anyone, but that’s one reason why I don’t mess with caliber conversions. When me and my buddy go shooting we have at least ten different guns on the table in several calibers.

It would be too easy for us to make the same mistake.

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Life Is A Gift. Defend it!

Don't you need a 9 mm Glock slide as well as the barrel? I know that you can swap .40 S&W barrels with the .357 Sig cartridge and use the same slide.

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John 3:16
WAR EAGLE!

No need for a slide change on a Model 22. Can also drop in 357SIG.
I do use 9mm mags , though.

I also shoot 357SIG and 40S&W in a P226. I'm currently waiting on a Bar-Sto 9mm barrel for it.

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" I don't recall, senator."

My Glock 35 became a full time 357 Sig.
Shoots like a laser 10 to 50 yards in club matches.

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-jwk-
US Army '72-'95