My G22's have $70 Rock Slide 9mm barrels.
I have several.
rockslideusa.com
Barrels are in stock now.
They like 124-grain 9mm fine.
Usually get some sort of cycling malfunction if I feed them 115 grain.
Makes no difference whether I use a 9mm or .40 extractor.
Run the same recoil spring for 9mm and .40 - although I tried different weight springs to try to get the 115-grain stuff to run. Didn't help.
I use 9mm magazines when I'm running 9mm in the G22.
I just avoid buying 115-grain 9mm ammo unless I KNOW I'm going to shoot it in a gun that was built from the git-go as a 9mm. Of which I have plenty git-go 9mm pistols. But the 124-grain stuff sells within a penny or two of the 115-grain. Can think of no good reason to buy any 115-grain 9mm at this point.
Maybe if you are worried about your only ammo source being stripping corpses for ammo, stay away from conversion barrels.
I don't really see that happening to me in what's left of my life.
I figure whatever ammo I'm gonna have is ammo I already have.
Besides, attractive-looking corpses are usually booby-trapped.
And LARP'ers with rifles AND pistols only carry pistols when they're LARP'ing.
Very unlikely you will come across a corpse with a rifle AND a pistol. If you do, its probably gonna be a shitty LARP'er. And his pistol will probably be some weird caliber. Not the 9mm you need.
Dead hood-rats usually have a candy-stripe assortment of ammo in their magazines. Literally every round different from the next.