Yes, call 'the man'

Email doesn't work well, call Tim (let the phone ring).

I don't recall all the details right off, but I think the tube has Engligh threads on one end, metric on the other. It comes with a plug with two o-rings to couple the tubes together and a coupler to hold them in place that also has english and metric threads. Works for both QBs (metric) and CR (English) guns. In your case you'd put the English end of the tube into the coupler and your metric bulk adaptor on the end. Crosman guns go the other way. Very clever, really.

Not to worry though, the only difference between the metric bulk adaptor and the English one is the threads. The sizes are otherwise the samee (and therefore the pulgs are the same). For five bucks more Tim will sell you an English ring (or a metric one) and you can change you adaptor as you wish.

It adds a lot of volume. IIRC the gun goes from one ounce to 2.5, more than doubling your shot count.

Good luck and good shooting.

Doug Owen