Would it be safe to make a tip for a stella barrel tip to replace a barrel bag/plug? Think of a tip but with no hole on the end.
Would screwing it on make it strong enough to stay on when the marker is accidentally fired? Perhaps glue some foam on the front in case it shoots off.
Just a thought that entered my head.
Sometimes the cord on a barrel bag annoys me, being able to screw the bag on and off would be a little easier.