You can see the wide selection of LWD G19 barrels here http://www.lonewolfdist.com/Search.aspx?TERM=lwd-19
They are drop in and seldom exhibit issues where factory ammunition is concerned.
Occasionally there is an issue with reloads. If your reload has an issue with the barrel chamber you have to ask yourself what you can do to get it closer to factory ammunition. If you don’t care that your reloads are out of specification LWD will open the chamber as wide as a Glock factory barrel..... But that sort of defeats the "full chamber support issue" doesn't it?