I'm interested in finding out the same thing you are.
After 35+ yrs of shooting I'm getting my first plastic gun. A Gen 2, G22. Most of the guys I shoot with that have Glocks have aftermarket bbls but in original cals.
I've 'google searched' and found some nice 'Youtube' vids. on the subject but would be nice to get some first -hand knowledge. As usual I'll probably end up being the guinea pig of our group.