MY XT has the screw in connection, for the
88oz CO2 in the back. It rests on top of the stock.
When I bought the hpa tank, I also purchased a brass
adaptor. The hpa tank comes with a regulator between
the tank and adaptor. I had him set it for 1200 psi.
As for the three screw stake down of the valve,
I hadn't heard about that yet. I went to the
Crosman Airgun Forum Tech section. Checked in
the external tank bulking section and the valve
mod section. I obviously missed it. Even if I
did find it,I don't have access to a drill
press. So I will just be patient, keep doing
my homework, and check with Mac1 today to see
if he can put me on the list.