10mm Barrel to 40 s&w

[Bayan Dundee]

just wondering if anyone knows whether or not a 10 mm Glock barrel, OEM or aftermarket, can have the chamber shortened by shrink installing a sleeve into the barrel which can then be reamed down to the correct headspacing depth to accept the 40 s&w round? basically just bringing the shoulder up the 2mm or so needed to match the 40 chamber.
As to why, just know that I live in Australia and our laws are silly

[sqlbullet]

Necessity is the mother of invention.

I would just shoot 40 in the 10mm barrel.  While not a recommended practice, it does work. 

[my_old_glock]

just wondering if anyone knows whether or not a 10 mm Glock barrel, OEM or aftermarket, can have the chamber shortened by shrink installing a sleeve into the barrel which can then be reamed down to the correct headspacing depth to accept the 40 s&w round? basically just bringing the shoulder up the 2mm or so needed to match the 40 chamber.
As to why, just know that I live in Australia and our laws are silly

Yes, it will work. Use red Loctite when installing. I suggest you do not use it for self-defense because it might move and cause the 40S&W cartridge not to chamber. The sleeve may expand at a different rate than the barrel and come loose even if you use Loctite.

If you want an aftermarket barrel, just get one already chambered for 40S&W (if you can in Australia).

.

[Bayan Dundee]

so far have only shot 40 in the 10mm barrel, accuracy not great and JHP don't stabilize but otherwise functions flawlessly, a conversion barrel is classed as a separate firearm and has to be registered, only permitted one handgun on my licence, only real option is to modify a 10 mm barrel which I am permitted to get several of, hope that makes sense. Need something definitive that I  can take to a gunsmith and get him to do what I want. proof of it reliably being done would help my attempts to find someone willing to do it.

[sqlbullet]

so far have only shot 40 in the 10mm barrel, accuracy not great and JHP don't stabilize but otherwise functions flawlessly, a conversion barrel is classed as a separate firearm and has to be registered, only permitted one handgun on my licence, only real option is to modify a 10 mm barrel which I am permitted to get several of, hope that makes sense. Need something definitive that I  can take to a gunsmith and get him to do what I want. proof of it reliably being done would help my attempts to find someone willing to do it.

Do we understand your legal challenges?  Yep.

Does it make sense? Nope.  But gun laws never do make sense to us

Let us know if the solution Shadow suggested works.

[The_Shadow]

There was a guy who once placed a sleeve in his 10mm barrel...not what I would want to do.  I can think of corrosion or rust issues over long term use.

I did buy a 40S&W conversion barrel because they offer the best for the cartridge. 
Better accuracy and velocity than shooting the 40 through the 10mm chambered barrel. 
Also after a range secession I can place the 10mm barrel and be ready for carry again.

Heck should the need arise you can ream the 40 S&W chamber to 10mm if needed...

[Forrest]

Sorry for the late entry.....
Several manufacturers of 1911 barrels short chamber them and stamp them the bore diameter. You could possibly negotiate a match barrel to be short chambered with a 10mm stamping for you to final chamber to your exact match specifications.

[sqlbullet]

Problem is he can't legally buy a second barrel.

[Superzuki]

just wondering if anyone knows whether or not a 10 mm Glock barrel, OEM or aftermarket, can have the chamber shortened by shrink installing a sleeve into the barrel which can then be reamed down to the correct headspacing depth to accept the 40 s&w round? basically just bringing the shoulder up the 2mm or so needed to match the 40 chamber.
As to why, just know that I live in Australia and our laws are silly

I've shot lots of 40 S&W in my 10MM. It works fine. It obviously isn't as hot as 10MM, but it shot fine.
John

[Pachary]

I have "heard" tales of fellas loading 40 cases to 10mm length only in Glocks. Not saying you should but have "heard" of guys shooting a bunch of rounds like this......

[dred]

Sorry for the late entry.....
Several manufacturers of 1911 barrels short chamber them and stamp them the bore diameter. You could possibly negotiate a match barrel to be short chambered with a 10mm stamping for you to final chamber to your exact match specifications.

This.  The OP can legally have 10mm replacement barrels and since .40 is 10mm - it should fly.  I'm not keen on sleeving a chamber for the reasons already posted.

I did miss the reason you aren't enjoying 10mm - but, I don't have much use for .40.

Finally - with one pistol on your license ... selling the 10, buying a 40, reaming spare barrel to 10mm is an overall cleaner solution if 40 is your primary caliber but you want the grown man's option.

[tundracamper]

It seems the regular 10 mm round is a 10x25. As suggested above, can't you have someone make a 10x22 and mark it as such? Then it's technically a 10 mm barrel.