I made the jump and bought a Kick's .665 choke tube.It is ported so I really expected a little improvement but not too much.
I also got a scope mount so I can use my red dot scope that I had laying around.
I must say that my initial opinion is a noticable difference in recoil.I shot a couple 3 1/2" 5's at 30 yards and the patterern was very tight,then I shot my last #4 at 20 just to see what would happen and it blew my board into about 3 pieces.
Usually 3 shots out of this gun would have me in quite a bit of pain but my shoulder was fine.
I think I have a good combo now and should be able to use 4's out to about 40 or so but some more patterning will be done first.