10 mm barrel to 40 s&w - Pistolsmith

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Old 10-26-2017, 09:32 PM   #1
Junior Member
Join Date: Apr 2017
Location: Australia
Posts: 7
10 mm barrel to 40 s&w

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
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Old 03-11-2020, 03:13 PM   #2
Junior Member
Join Date: Mar 2020
Location: US
Posts: 3
I'm not sure about modifications to the barrel, but I have read reports of owners firing .40 through the 10mm barrel with no damage and acceptable accuracy. Good luck, draconian firearms laws suck.
Old 03-13-2020, 04:13 PM   #3
Senior Member
Join Date: Jun 2001
Posts: 1,800
Doing a shrink installation is always rather "iffy" but it's most iffy in a bottle neck cartridge like was done in the M1 Rifle to convert to .308.
These had a bad habit of extracting and ejecting the insert and the next round would feed and fire unless the shooter was very lucky enough to notice the insert was ejected.

I suspect this would work in a 10mm pistol, but the cost will likely be high and you'll need a gunsmith who's VERY up to his game to insure the insert stays put.

The up side is, you're dealing with a straight pistol case operating at much less pressure then a center fire high power bottle neck rifle cartridge.

Last edited by dfariswheel; 03-13-2020 at 04:16 PM.
Old 03-30-2020, 11:40 PM   #4
Junior Member
Join Date: Mar 2020
Posts: 3
Can't you just purchase a 40S&W barrel? Or are the Aussie state regs preventing you from having a spare barrel for your pistol?


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