Because valves are failing all the time right? How long did it take you to think up that pathetic reason for not wanting to use CBIs?robf wrote:CBI is an oxymoron.
The first time a knock open valve fails with one of these in perhaps we will see why sticking something into the barrel past the transfer port is a pretty idiotic way of showing a barrel is clear.
Sad to see the sport displaying such basic safety ignorance.
It wi be fine until someone assumes the practice works in all air rifles then pus the trigger on one brand and finds the electronic trigger works with bolt open and discharges air into the barrel and buries one of these things into hopefully nothing more serious than a ceiling.
If the CBI is passed right through the barrel (as required) it will be both in front of and behind the transfer port. The barrel will be open to atmospere at both ends. If somehow the vavle should suddenly let go of its air, all that will happen is that the air will vent past the CBI out of both ends of the barrel.
If your version of a CBI is a close fitting bung in one end of the barrel then perhaps your dream might become reality. I challenge you to actually fire a piece of line trimmer line (that's protruding out both ends of your barrel) from your airgun to prove your theory.