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View Full Version : Do G20 factory barrels have fully supported chambers?


savasyn
01-02-2011, 1:47 PM
With all the talk about Glock .40s not having full supported chambers, I'm curious about the factory 10mm barrels that come in the G20. Do they have fully supported chambers allowing for high-end 10mm rounds or do you have to be careful about running into higher pressure ranges?
Thanks!

B Strong
01-02-2011, 1:50 PM
No major caliber Glocks have supported chambers.

Turo
01-02-2011, 2:10 PM
None of the GLOCKS have fully supported chambers, but the 3rd generation guns' chambers are much more supported than the older generations. You have to remember though, that most of the "unsupported chamber" stuff is hype. No semi-auto handgun is going to have a fully supported chamber, that's why casings are made of metal.
The GLOCKS tend to have less support than other guns, but I highly doubt that GLOCK would release a gun in 10mm without it being able to shoot full-powered (and probably over-powered to an extent) 10mm ammunition.

cineski
01-02-2011, 2:22 PM
Unsupported = reliable.

Noobert
01-02-2011, 2:24 PM
http://www.everydaynodaysoff.com/wp-content/uploads/2009/12/howaglockworks.gif

Agent Tikki
01-02-2011, 2:34 PM
G20/29 barrels are not unsupported.

They have less support than say a Lone Wolf, Stormlake, Barsto, KKM barrel. For factory stuff, they are fine. For hotter rounds they are fine.

You only really need an aftermarket barrel if you wanna shoot lead or if you are gonna start pushing the envelop and load over SAAMI specs.......

XDRoX
01-02-2011, 2:41 PM
Glock chambers are supported just as much as the other big name companies. Their first generation guns were less supported than they are now which is where a lot of the internet hype came from.

I once took some pictures of some of my guns chambers. One comparison I made was a 3rd gen G19, a 1st gen XD9, and a P228.

The XD9 was obviously the least supported of the three.

HighLander51
01-02-2011, 3:55 PM
The .357SIG calibers have the 'least' amount of belly, or the most support of all available Glock calibers (since it is a bottleneck it needs only a little ramp). Because all of the ramp is in the barrel in a Glock, there is some case showing. Go to a 1911 platform if that worries you as most of the ramp is in the frame.


http://www.californiavtxriders.com/phpBB3/gallery/image34594.jpg

http://www.californiavtxriders.com/phpBB3/gallery/image34593.jpg

DRAB_81
01-02-2011, 4:18 PM
I felt 100% confident that Double Tap & Buffalo Bore would shoot safely in my stock barrel, and they did. Anything factory loaded is safe to put through the stock barrel. On the other hand, my Nuclear handloads (example: 200gr WFNGC@1400fps) will NEVER be fired through my stock barrel...

B Strong
01-02-2011, 5:15 PM
Here are some different factory/aftermarket Glock .45 barrels for comparison:

http://img35.imageshack.us/img35/4369/glockbarrels.jpg

From Left:

Factory G21 barrel

Factory G30 Barrel

Unknown manufacturer G21 aftermarket extended threaded stainless

Jarvis G21 6"

Wilson Combat G21

Another view:

http://img34.imageshack.us/img34/287/glockbarrels2.jpg

B Strong
01-02-2011, 5:19 PM
The .357SIG calibers have the 'least' amount of belly, or the most support of all available Glock calibers (since it is a bottleneck it needs only a little ramp). Because all of the ramp is in the barrel in a Glock, there is some case showing. Go to a 1911 platform if that worries you as most of the ramp is in the frame.

http://www.californiavtxriders.com/phpBB3/gallery/image34593.jpg

highlander - it's not the feedramp that's the issue in Glocks, and certainly not in 111's, it's the "throat" area of the chamber, as seen in my pics above. The area of the case left unsupported is what leads to problems.

HighLander51
01-02-2011, 5:28 PM
it's the "throat" area of the chamber, as seen in my pics above.

You need to put a round in those barrels and take a pic, thats the only way to know how much of the case is unsupported

savasyn
01-02-2011, 6:48 PM
Awesome, thanks for all the info!!
I plan on reloading for it, but I do not intend to run max charges. I'm considering getting a KKM barrel for it eventually as I've had good luck with them in other Glocks.

ECVMatt
01-02-2011, 7:14 PM
I shot my 20 for years with a factory bbl. I did notice a bulge in the bottom of the cases, but never had an issue. Recently I purchases a KKM barrel for my 20 and wish I did so many years ago. I have no bulges at all and it is 100% reliable. Accuracy was also improved. I also have one for my 31 in 40 S&W. It shot so well I decided to try one for the 20. Two barrels, two fantastic shooters....

B Strong
01-03-2011, 7:25 AM
it's the "throat" area of the chamber, as seen in my pics above.

You need to put a round in those barrels and take a pic, thats the only way to know how much of the case is unsupported

The pic is a comparison between factory/aftermarket barrels.

I'll gear up sonetime later and take some round in the chamber comparison pics, but the above pics make the difference between factory/aftermarket pretty clear imo.

Oceanbob
01-03-2011, 10:41 AM
The barrels that GLOCK makes and the aftermarket are very close.

From left to right:

Lonewolf....Glock 20 factory....Stormlake....KKM....Glock 29 factory.

The GLOCK 29 factory is slightly smiley. Not much. The GLOCK 20 factory is the same or better than the others. My conclusion is 'nothing to worry about'.

http://i55.tinypic.com/35cog2o.jpg

Turbinator
01-03-2011, 10:44 PM
None of the GLOCKS have fully supported chambers

Huh? The 9mm's I've seen are supported just fine.

Turby

Turo
01-04-2011, 1:42 AM
Huh? The 9mm's I've seen are supported just fine.

Turby

I was more referring to the fact that you can't possibly support every part of the shell in a semi-auto. The feed ramp has to go into the chamber, even if it's really small, you can't fully support a casing unless you mold something around it and make a perfect fit.

I would agree with you that the GLOCK chambers support 9mm just fine, but they aren't "fully" supported, because there's always going to be some part of the brass that doesn't have steel touching it.