Author Topic: .40 s&w in unconverted 10mm Glock (Read 5073 times)

BanxJ502 · « **on:** July 16, 2015, 01:41:19 am »

Does anyone have any experience with this? I was reading some random page about a guy who has shot 5,000+ rounds of .40 s&w out of his unconverted 10mm glock 20. He covered why its completely safe to the point he actually says its safer to shoot 40 s&w out a 10mm than it is to shoot .40 s&w out of a .40 S&W glock because the 10mm's are so beefy to handle the round.

If this is true (and based on other searches it just might be) it would be nice to shoot .40 out of my 10mm's due to the cheaper ammo.

ArizonaGunOwners.com

car-ram-rod · « **Reply #1 on:** July 16, 2015, 05:38:21 am »

Are you talking about not changing the barrel?

Intel6 · « **Reply #2 on:** July 16, 2015, 06:30:41 am »

I have done it and know of a competition shooter who fired .40 in a stock G20 for quite some time. I have done it and it does work but since the round is not supported by the front edge of the chamber the extractor is the only thing keeping the round against the face of the slide. If you fire some rounds through it look at all the fired cases and decide if you want to continue. You will find cases that look fine and you will find cases where the primer expanded out as the round was fired because it wasn't back against the breech face.

I have done it and say try it out for yourself but I went ahead and got a .40 S&W barrel for my G20 so I can fire .40 with just a barrel change and not worry about blowing out my extractor at some point in time.

martin · « **Reply #3 on:** July 16, 2015, 08:55:04 am »

It works for sure & gtg if your 10mm supply is out - not a long term solution...

BanxJ502 · « **Reply #4 on:** July 16, 2015, 09:56:49 am »

Yes i meant with just the standard 10mm barrel. I know there are conversion barrels, but i was just curious if there are any safety issues with this.

Another thing i was concerned about is erosion where the rifling starts since the .40 will have to "jump" a little bit to get from the case to the rifling, but the same guy says it doesnt cause any problems. Sort of like shooting 38 out of a 357, or any revolver at all really.

870policemag · « **Reply #5 on:** July 16, 2015, 10:09:12 am »

There's plenty of videos on YouTube of guys doing this. I'm sure it would work in a pinch but I wouldn't make it a habit. I wonder how many FPS you lose vs the 10mm.

JesseL · « **Reply #6 on:** July 16, 2015, 10:23:20 am »

Headspacing from the extractor isn't exactly a great recipe for accuracy and it won't do great things for the life of your brass if you reload. You could end up with some fouling at the front of the chamber that might cause feeding issues when you switch back to shooting 10mm too.

I don't think there's going to be any safety issues though.

car-ram-rod · « **Reply #7 on:** July 16, 2015, 10:37:17 am »

Man I hate online experts. Sure it'll work but pressure curves, premature wear, reliability issues. Just get the barrel man.

FreeInAZ · « **Reply #8 on:** July 16, 2015, 11:49:50 am »

Call Glock, not the local 'guru' but Glock USA in GA & see what they say? That's the safe route IMHO. My bet is: they say buy the barrel.

Thernlund · « **Reply #9 on:** July 16, 2015, 02:16:52 pm »

I wouldn't do it. As mentioned, probably not a safety issue, but not really ideal.

-T.

JesseL · « **Reply #10 on:** July 16, 2015, 02:22:11 pm »

Quote from: FreeInAZ on July 16, 2015, 11:49:50 am

Call Glock, not the local 'guru' but Glock USA in GA & see what they say? That's the safe route IMHO. My bet is: they say buy the barrel.

I don't expect they'd endorse an aftermarket conversion barrel. My bet is that the official answer would be to just buy another Glock in .40.

FreeInAZ · « **Reply #11 on:** July 16, 2015, 02:37:00 pm »

Quote from: JesseL on July 16, 2015, 02:22:11 pm

I don't expect they'd endorse an aftermarket conversion barrel. My bet is that the official answer would be to just buy another Glock in .40.

Yep - or try to sell him factory barrel?

He seems to go through bouts of tinkering and selling - IIRC, he sold a Glock in 40 cal not long ago.

Hey - nothing wrong with that.

LuckyLeaky · « **Reply #12 on:** July 16, 2015, 02:44:26 pm »

Imma try this in the delta..........not

JesseL · « **Reply #13 on:** July 16, 2015, 03:33:00 pm »

Quote from: FreeInAZ on July 16, 2015, 02:37:00 pm

Yep - or try to sell him factory barrel?

He seems to go through bouts of tinkering and selling - IIRC, he sold a Glock in 40 cal not long ago.

Hey - nothing wrong with that.

I don't think there's a factory .40 barrel that will drop into a 10mm Glock though. The ejection port on the G20 should be longer than the G22.

FreeInAZ · « **Reply #14 on:** July 16, 2015, 05:19:03 pm »

Doh! Good point

FACE · « **Reply #15 on:** July 17, 2015, 01:30:03 am »

Quote from: LuckyLeaky on July 16, 2015, 02:44:26 pm

Imma try this in the delta..........not

Ha!

BanxJ502 · « **Reply #16 on:** July 17, 2015, 03:59:48 pm »

I dont mind buying the barrel, i was just curious if it could be done safely. Personally i would be a little nervous trying it...

Also, supposedly it will only work in glocks, not a 1911 or smith 10mm, only glocks. Im not entirely sure why but thats what ive heard.

FACE · « **Reply #17 on:** July 17, 2015, 06:25:02 pm »

Cause 1911s are like fine art, no one cares if you blow up a glock.

870policemag · « **Reply #18 on:** July 17, 2015, 07:53:57 pm »

Quote from: FACE on July 17, 2015, 06:25:02 pm

Cause 1911s are like fine art, no one cares if you blow up a glock.

I'm a Glock and Colt 1911 owner and I approve this message.

Marx-ism's · « **Reply #19 on:** July 17, 2015, 10:12:15 pm »

Quote from: FACE on July 17, 2015, 06:25:02 pm

Cause 1911s are like fine art, no one cares if you blow up a glock.

ItWasntMe · « **Reply #20 on:** July 17, 2015, 10:17:19 pm »

Quote from: FACE on July 17, 2015, 06:25:02 pm

[...] no one cares if you blow up a glock.

If it were my Glock, I'd care a fair bit.

FreeInAZ · « **Reply #21 on:** July 17, 2015, 10:21:53 pm »

Quote from: ItWasntMe on July 17, 2015, 10:17:19 pm

If it were my Glock, I'd care a fair bit.

Me too!

:

FACE · « **Reply #22 on:** July 17, 2015, 10:28:30 pm »

Teehee

dakota1911 · « **Reply #23 on:** August 07, 2015, 12:18:23 pm »

I would not do it. The Glock extractor is good and that is what is holding the 40 S&W round where the firing pin can hit it. In a worst case situation it might go boom in your face.

ArizonaGunOwners.com