10mm Glock barrel/caliber change ?

Metal god · November 9, 2017, 03:46 AM

Looking to buy a 10mm Glock 20 in the SF version .

I'd also like to get a 40 S&W barrel for it as well as 357sig

Can those two cartridges be fired reliably using the 10mm firearm and it's factory magazine ?

jmr40 · November 9, 2017, 06:55 AM

I fire 40 S&W through the 10mm barrel. It feeds just fine in the 10mm magazine. If I planned on shooting a LOT of 40 ammo then it would probably be advisable to get the 40 barrel. I would assume the 357 Sig would work just as well, but no personal experience.

brian33x51 · November 9, 2017, 08:31 AM

I've seen people report 10k rds of 40 in their 10mm barrel. I havent done that myself as I have a 40 pistol already.

Dan-O · November 9, 2017, 08:49 AM

I shoot .40 from my 10mm glocks, S&W’s, etc. You would need a conversion barrel for 357sig. 10mm mags will feed .40 and 357sig reliably.

Metal god · November 9, 2017, 11:46 AM

How are you guys shooting 40 out of the 10 ? Don’t they both headspace off the mouth and the 10mm case is longer ???

Duck of Death · November 9, 2017, 01:37 PM

40 SW is held by the extractor & fires just fine in a Glock 10mm barrel. Makes for a mild load in my G29.

Dan-O · November 9, 2017, 02:26 PM

I shoot .40 from my g-20 long slide. Literally feels like a weak 9mm. From my all steel Smitty 1006 it feels like a mouse fart.

Hammerhead · November 9, 2017, 02:39 PM

I started out shooting .40 ammo in my 10mm barrel, worked great. Liked the .40 so much in the 10mm guns that I bought KKM .40 conversion barrels for the G-20 and a G-29. No problems.

For a while I ran .40 handloads (less than max) in my G-20 with a 20 pound recoil spring on a steel rod, ran great, shot great, soft recoil.

Hammerhead · November 9, 2017, 02:46 PM

BTW, the KKM barrels were conventional land and groove rifling and were more accurate with plated bullets than the stock 10mm barrels.

agtman · November 11, 2017, 08:36 AM

Quote:

Looking to buy a 10mm Glock 20 in the SF version .
I'd also like to get a 40 S&W barrel for it as well as 357sig

Can those two cartridges be fired reliably using the 10mm firearm and it's factory magazine?

Yes.

Been there, done that very that ... G20 and a G29. Aftermarket barrels, but same factory 10mm magazines and same factory 10mm recoil assembly.

In theory, it would/should also work in the longslide G40 MOS, if some aftermarket vendor actually made 6.2" tubes chambered in these other 10mm-derivative cartridges.

The easy barrel-swapping capability of the Glock 10mms - with nothing else needed - gives you a 4-caliber autoloader: 10mm, .40S&W, .357Sig, and 9x25 Dillon.

Just pick your favorite 10mm Glock and be done with it.

November 9, 2017, 03:46 AM	#1
Metal god Senior Member Join Date: April 10, 2012 Location: San Diego CA Posts: 6,876	10mm Glock barrel/caliber change ? Looking to buy a 10mm Glock 20 in the SF version . I'd also like to get a 40 S&W barrel for it as well as 357sig Can those two cartridges be fired reliably using the 10mm firearm and it's factory magazine ? __________________ If Jesus had a gun , he'd probably still be alive ! I almost always write my posts regardless of content in a jovial manor and intent . If that's not how you took it , please try again .

November 9, 2017, 06:55 AM	#2
jmr40 Senior Member Join Date: June 15, 2008 Location: Georgia Posts: 10,808	I fire 40 S&W through the 10mm barrel. It feeds just fine in the 10mm magazine. If I planned on shooting a LOT of 40 ammo then it would probably be advisable to get the 40 barrel. I would assume the 357 Sig would work just as well, but no personal experience. __________________ "If you're still doing things the same way you were doing them 10 years ago, you're doing it wrong" Winston Churchill

November 9, 2017, 11:46 AM	#5
Metal god Senior Member Join Date: April 10, 2012 Location: San Diego CA Posts: 6,876	How are you guys shooting 40 out of the 10 ? Don’t they both headspace off the mouth and the 10mm case is longer ??? __________________ If Jesus had a gun , he'd probably still be alive ! I almost always write my posts regardless of content in a jovial manor and intent . If that's not how you took it , please try again .

November 9, 2017, 08:31 AM	#3
brian33x51 Senior Member Join Date: January 24, 2005 Location: Denver area Posts: 221	I've seen people report 10k rds of 40 in their 10mm barrel. I havent done that myself as I have a 40 pistol already.

November 9, 2017, 08:49 AM	#4
Dan-O Senior Member Join Date: August 3, 2011 Location: Northern Colorado Posts: 969	I shoot .40 from my 10mm glocks, S&W’s, etc. You would need a conversion barrel for 357sig. 10mm mags will feed .40 and 357sig reliably.

November 9, 2017, 01:37 PM	#6
Duck of Death Member Join Date: July 10, 2016 Posts: 30	40 SW is held by the extractor & fires just fine in a Glock 10mm barrel. Makes for a mild load in my G29.

November 9, 2017, 02:26 PM	#7
Dan-O Senior Member Join Date: August 3, 2011 Location: Northern Colorado Posts: 969	I shoot .40 from my g-20 long slide. Literally feels like a weak 9mm. From my all steel Smitty 1006 it feels like a mouse fart.

November 9, 2017, 02:39 PM	#8
Hammerhead Senior Member Join Date: May 31, 2004 Location: Minnesota Posts: 2,432	I started out shooting .40 ammo in my 10mm barrel, worked great. Liked the .40 so much in the 10mm guns that I bought KKM .40 conversion barrels for the G-20 and a G-29. No problems. For a while I ran .40 handloads (less than max) in my G-20 with a 20 pound recoil spring on a steel rod, ran great, shot great, soft recoil.

November 9, 2017, 02:46 PM	#9
Hammerhead Senior Member Join Date: May 31, 2004 Location: Minnesota Posts: 2,432	BTW, the KKM barrels were conventional land and groove rifling and were more accurate with plated bullets than the stock 10mm barrels.