Glockmeister Tech Tips - Barrel Conversions
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Each newsletter we will provide tips from our senior GLOCK armorers focusing on the performance and maintenance of GLOCK pistols.

Barrel Conversions

Depending on their caliber and configuration, some GLOCK pistols can be converted to shoot other calibers by swapping barrels and magazines. In this newsletter we will cover GLOCK barrel conversions.

PLEASE NOTE THAT BARREL CONVERSIONS ARE INTENDED FOR RANGE USE ONLY AND SHOULD NOT BE USED IN CARRY, PERSONAL PROTECTION, OR DUTY SITUATIONS. 

Conversion Barrels

As a general rule, you can convert down in caliber but not up. A conversion barrels job is to replicate the outer dimensions of the barrel it is replacing while providing a change in caliber. Think about it this way, if you wanted to convert your .40 S&W GLOCK 22 to shoot 9mm and you replaced the barrel with a stock 9mm GLOCK 17 barrel, the tolerances would be off because a .40 S&W barrel has a larger diameter than a 9mm barrel. This can pose a risk of harm to both the shooter and the pistol. A conversion barrel makes it possible to safely fire a different caliber from your GLOCK.

.380 ACP

There are currently no barrel conversions for the GLOCK 42.

9MM

There are currently no barrel conversions for 9mm GLOCK pistols.

40 S&W and 357 SIG

.40 and .357 GLOCK pistols are extremely similar. Essentially .357 SIG is a .40 S&W case necked down to accept a .355 inch bullet that is similar to a 9mm bullet. Because of this similarity, .40 and .357 pistols are able to swap stock corresponding size barrels with each other. For instance, to convert a GLOCK 31 to fire .40 S&W you would simply replace the barrel with a GLOCK 22 stock barrel. To convert a GLOCK 27 to .357 SIG you would use a GLOCK 33 stock barrel and so on. You can use your existing magazines for 40/357 conversions.

.40 S&W and .357 SIG pistols are also able to convert to 9mm. In order to convert to 9mm you will need a conversion barrel and 9mm magazine. For instance, if you have a GLOCK 27 you would need a GLOCK 27-9mm conversion barrel and a GLOCK 26 9mm magazine. Most companies do not make 9mm conversion barrels specifically for the .357 SIG however you can use the corresponding .40 S&W conversion barrel and 9mm magazine to accomplish this conversion in a .357 SIG pistol. An example of this would be using a G22-9mm conversion barrel and a GLOCK 17 9mm magazine in a GLOCK 31 to convert to 9mm.

10MM

10mm GLOCK pistols are able to convert to both .40 S&W and .357 SIG. To accomplish these conversions you need either a .40 S&W or .357 SIG conversion barrel. You will use your existing 10mm magazines for these conversions. 

45 ACP

.45 ACP GLOCK pistols (with the exceptions of the G30S, G36, and G41) are able to convert to 10mm. This conversion requires a 45-10mm conversion barrel and a 10mm magazine.

45 GAP

There are currently no barrel conversions for 45 GAP GLOCK pistols.

Barrel conversions generally work very well. However, depending on your particular pistol and the ammo you use you may have to change recoil spring weights, extractors, or ejectors to make your pistol function with a barrel conversion. If this is the case, you can always call our technical support line for more information. Remember, barrel conversions are only intended for range and practice applications.



 
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Are you interested in a barrel conversion for your GLOCK? Check out our selection of Storm Lake conversion barrels and GLOCK factory barrels.

Storm Lake

G22/31 - 9mm Barrel

Storm Lake Barrels are match grade and offer a fully supported chamber; perfect for increasing accuracy and use with reloaded ammunition.

Use this barrel to convert your GLOCK 22 or 31 to shoot 9mm.
Purchase Here

Storm Lake

G27/33 - 9mm Barrel

Storm Lake Barrels are match grade and offer a fully supported chamber; perfect for increasing accuracy and use with reloaded ammunition.

Use this barrel to convert your GLOCK 27 or 33 to shoot 9mm.
 
Purchase Here

Storm Lake

G21 - 10mm Barrel

Storm Lake Barrels are match grade and offer a fully supported chamber; perfect for increasing accuracy and use with reloaded ammunition.

Use this barrel to convert your GLOCK 21 to shoot 10mm.
 
Purchase Here

Storm Lake

G23/32 - 9mm Barrel

Storm Lake Barrels are match grade and offer a fully supported chamber; perfect for increasing accuracy and use with reloaded ammunition.

Use this barrel to convert your GLOCK 23 or 32 to shoot 9mm.
Purchase Here

Storm Lake

G20 - 40SW Barrel

Storm Lake Barrels are match grade and offer a fully supported chamber; perfect for increasing accuracy and use with reloaded ammunition.

Use this barrel to convert your GLOCK 20 to shoot 40S&W.
 
Purchase Here

GLOCK

Factory Barrels

We offer a full selection of GLOCK factory barrels. These are the same barrels that come with new GLOCK pistols. Use them as replacements, spares, or in 40/357 conversions.


 
Purchase Here
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