G21/g21sf?

[Arc Angel]

Hello JR,

I've been told that the 3rd gen. G21 barrel's chamber sidewall (and possibly lug) configuration is not identical to a 3rd gen. G21SF. The SF's vertical chamber walls are supposed to be thicker. (Or, is it the slide sidewalls in the immediate vicinity?)

Would you comment on this please. As always, thanks!

[JR]

Glock Inc has been changing their chambers over the last few years. Yes you will notice more support in these barrels. You will also notice the feed ramp angle is changed contributing to a "thicker" looking barrel.
No worries, the old barrels still work in the Gen4 guns.

[Arc Angel]

JR, Thank you for the right answer to a tough question.

(Nobody else seemed to agree with me; but, I was sure I'd read it on here somewhere!)