I'm looking at a S3F barrel right now. The biggest issue is it's going into a CCF Raceframe and I'm trying to be cautious of the fact they designed the locking block slightly oversized for standard Glock barrels to drop in and claim that improper fitting barrels can cause damage.
I've heard Zev works really good, but can't bring myself to spend $300 on a Zev barrel. <$200 for exactly what I want from S3F would be great if it doesn't need fitting. I tried emailing them to see where there spec fits but haven't heard back.