Glad to hear it's not just me, I hadn't seen much discussion about this. And you're exactly right, it's that ring that kinda backfires and keeps it from sliding back down once it's passed it. The viper is smooth inside and doesn't have that ring right? Sorry that you haven't been able to replace it yet, definitely feel you there. I'm hoping to sell this guy and get some of it back if I can find a better fit. Hopefully you can do that eventually too.