Sidearms & Scatterguns Glock 21 -20 conversion

[acts238]

I've been looking for a 10mm conversion barrel for my 21
Can't seem to find any
If you know a source please post it
While I was polishing several Glocks last night for a friend and noticed that the 20 barrel fit perfectly in the 21 and vice versa - the ID diameter if the hole in the slide and the OD of the barrels seems to be the same on both
Has any one tried shooting a 20 barrel in a 21 ?
I don't see why it wouldn't work

 

[Hairball]

You can get a 10mm conversion to fit a 21 but a .45 conversion will not fit a 20. I get all my glock stuff from glockstore.com

 

[banditbump]

If lonewolf doesn't make or have it for a glock it probably isn't possible or doesn't exist. They make and sell tons of drop in caliber change barrels for glocks....gl

 

[hermosabeach]

https://www.lonewolfdist.com/Detail.aspx?PROD=512&TERM=10mm
or
Shopping Cart | KKM Precision

Just like with the 40-9 conversion, some say you need to swap extractors and others say they run fine as is....

 

[hermosabeach]

This might help with the project
https://www.youtube.com/watch?v=I3UEi2abpRQ

 

[acts238]

https://www.lonewolfdist.com/Detail....=512&TERM=10mm
or
Shopping Cart | KKM Precision
neither of these show "conversion barrels"
they both show 10mm barrels
so I assume it doesn't have to be a conversion barrel ?

 

[BurnOut]

I was given to understand that converting either of the large frame Glocks to the other caliber required a corresponding slide (See note next to G20/G21 slides: Lone Wolf Distributors - Products - Slides), but if you're saying that the barrels are interchangeable... have you simply fitted them together, or have you measured the barrel OD and the slide "barrel hole" ID of each gun to confirm sizing?

If this actually works, it could be pretty interesting...

 

[EXTREMEPREJUDICE]

The chamber hood on the factory G20 barrel is thinner so it won't work correctly with a factory 21 slide, you'll need a conversion barrel. The recoil spring is the same. You can either swap the extractor back and forth or modify the G21 extractor so it will work with both the .40 and .45 cal. If you use your "Google Fu" you'll find quite a little info on it. I bought a Storm Lake conversion barrel and G20 extractor for mine but then a member here had a new G20 barrel and top end for sale so I just grabbed it and just swap the whole deal back and forth. Obviously you'll need G20 mags.

 

[OLD18C]

Here is a photo of my Glock 30 with a BarSto 10mm conversion barrel, shoots really well. I like the KKM barrels and have a few but got the BarSto at a great price. LoneWolf or the Glock store should have everything you need.