It's the retention issues with the Serpa. I'm planning on taking some training and most training "camps" don't allow them anymore.Why not get a serpa for a g17. Same holster but a bit longer if the barrel sticking out bothers you. Maybe a 17L? Why not mod current one with kydex?
I love serpa holsters. When needing a bit more concealment or comfort in a vehicle or working around a Sticky holster can't be beat.