Just a heads up if you're using a foaming cleaner.
When they get out the back end of the chamber and your receiver has an exposed front action screw (700's, etc.), these foaming cleaners creep between the screw threads and action threads and get between the receiver and the bedding.
The tapered stopper setup seals the back of the chamber so this doesn't happen. A dab of non hardening sealer on the front action screw threads helps too.
You don’t need the tapered stopper. The tube I’m showing is soft enough that you seal the chamber at the neck. No cleaner gets behind it.
