Originally Posted by teamcaution1234
wouldnt it be cocker to ion because you are making the cocker barrel to an ion barrel
I've seen companies use both methods to describe the same thing so I'm not sure there's any real standard out there. I agree with the other guy though, should be gun to barrel, so in this case, Ion to Cocker.
Personally, I'm not a fan of adapters as many of them are .690ish bores, and many barrels are smaller than that. So it basically puts a "bubble" in the path of the ball down the barrel, as well as increasing the possibility of a barrel break from the ball clipping the edges as it transitions from one to the other.
The only way to adapt cocker barrels and size properly (go from a smaller initial bore to a bigger one) is to use a TechT I-Fit kit-> http://www.techtpaintball.com/ifit_pr-3211.aspx
IMO you always want to have the sizer/adapter bore be smaller than the barrel at least slightly to avoid issues. Most cheap adapters use large bores, so buyer beware.