.40 cal Gen4 Glock owners I need some help with barrel diameter.

[arakboss]

If anybody owns a Gen 4 Glock in .40 cal could you please measure the outside diameter of the barrel near the muzzle end let me know what your measurement is. I measured my Gen 4 G17 9mm barrel and it was about .570inches. I suspect the .40 cal barrel might be the same diameter. Thanks a bunch!

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[Stomper]

So... your saying diameter is more critical than length?

 

[arakboss]

So... your saying diameter is more critical than length?

Today I am elevating the importance of girth over length. I am really hoping the .40 barrel is the same outside diameter as my 9mm barrel. I just poked a .40 M&P barrel through the g17 slide hole with no lube. It just slipped right through.

 

[KKG]

Today I am elevating the importance of girth over length. I am really hoping the .40 barrel is the same outside diameter as my 9mm barrel. I just poked a .40 M&P barrel through the g17 slide hole with no lube. It just slipped right through.

It should. They are the same.

 

[arakboss]

It should. They are the same.

I read somewhere on web that at least one generation of .40 glock barrels were around .587 so my hopes have dimmed

 

[TTSX]

If you're any good with a lathe, you could make it any diameter you want, I suppose. Or a ton of sandpaper.

 

[arakboss]

If you're any good with a lathe, you could make it any diameter you want, I suppose. Or a ton of sandpaper.

I thought about that. My M&P 40 barrel is .565 outside diameter and the barrel wall thickness of .086. I might just order a cheap BCA 40 barrel to play around with.

 

[arakboss]

If anybody owns a Gen 4 Glock in .40 cal could you please measure the outside diameter of the barrel near the muzzle end let me know what your measurement is. I measured my Gen 4 G17 9mm barrel and it was about .570inches. I suspect the .40 cal barrel might be the same diameter. Thanks a bunch!

I thought about that. My M&P 40 barrel is .565 outside diameter and the barrel wall thickness of .086. I might just order a cheap BCA 40 barrel to play around with.

Breech face modifications would be above my pay grade so this project idea is a bust

 

[EPS]

I think there the same because you can interchange some or convert so to shoot different caliber but I'm not positive.
I do have a gen 4 Glock 22 in 40 but I don't have the right type of tools to measure it .

 

[Seraphim38]

NO, for example, a Glock 34 9mm Barrel will not DROP IN a Glock 35 .40 S&W.

I have a Glock 35 and purchased a 9mm conversion barrel which works fine.

You can drop a Glock 35 barrel into a Glock 22 to change the barrel length but not the caliber

 

[EPS]

There not the same here is a Glock 22 barrel and a Glock 19 barrel .
I don't have a 17 so can't help out with that .
The black one is a 19 barrel the 40 is a tiny bit bigger.

 

[titsonritz]

The slides and barrels between 9mm and 40S&W Glocks are NOT the same.

 

[osprey]

You will find coversion barrels from larger to smaller calibers but not the other way around.

 

[arakboss]

You will find coversion barrels from larger to smaller calibers but not the other way around.

I get the reason why. I wasn't even thinking about the breech face on the slide not being large enough for a larger caliber and grinding on it doesn't look like a good idea to me.

 

[Seraphim38]

@arakboss the breech face is not the only difference. The Ejectors are different, and there are other differences.