Originally Posted by drg
There really aren't, or maybe more specifically it can't really be made as easy to unscrew as a bucket changer due to simple differences in design. A bucket changer can be grasped with the entire hand, which in turn allows more screwing/unscrewing force to be placed on it more ergonomically compared to any knob short of one the length and size of a bucket changer. This in turn allows the ultimate ease of operation given the coarsest legal threading; coarsely threaded plugs can be difficult to remove or even get partly stuck, making changing difficult or slowing it down.
Other issues:Bucket changers can be changed while still holding the gun up ... though this may not be a huge advantage. Slam changers and the above rendering are not stock legal.
We could easily get into the why things are or aren't SC legal debat but thats not where I would like this to go. Instead let me simply say throw out the SC rules, NPPL rules, all rules about what makes a setup legal or illegal out the window, playing simply for fun. There are a lot of cool things that you can do with in grip air to make it quick and easy to change. The setup I am working on for example (Nelspot with battle grips and a lever to puncture and release the 12ie on the bottom of the grip) is very quick and easy with a little practice.
I'm sure that strict SC rules and heavy competition was a driving factor in making this air source scarce though. Not arguing that at all.