I have a G2 with a 10" .22 lr and a 14" .204 ruger. Both are a hoot to shoot. I want more barrels. I see something like 'super' 14" barrel or 14 'bull' barrel. What do 'super' and 'bull' refer to? Do they fit a G2frame? I also see 'octagon' barrels. I know what an octagon looks like but does the octagon fit a regular G2 frame? Advantages/disadvantages of any of the barrels I've mentioned?