I was wondering if anyone else had noticed jams due to the rollback with a Halo? I was fine tuning a bit, always looking to perfect the setup, and notice the paint I was using, PMI prem., would roll back allowing another ball to be pushed down in front of the breeched ball. I havent noticed it to be a problem AS MUCH with my Revvie, but still an issue. My question is, what ideas could I try to fix this? Im thinking of cutting an O-ring slot inside the front of the bolt face. Any ideas, suggestions or modifications to anything youve read would be nice.