On mine, the impression isn't as long as what FX uses. Fx is very inventive with their press. The press/die follows the curve along the axis. The die is a circular form that presses from all sides with equal pressure creating the impressions at once. The impression is progressive. Meaning, from the start (furthest point away from muzzle) the impression is shallow and becomes deeper toward the muzzle. Mine is just an impression of the same magnitude from start to end and not as long.
Yes, the barrel could be used on any 7/16 barreld Crosman gun. After all, the barrel is from a smooth bore 760.
The first one I came up with... It uses 2 inches of rifled barrel at the end of a smooth bore barrel. The two are held together with a brass sleeve. Works well.
"Well, I thought it was a rabbit but it turned out to be Bear Grylls in a rabbit hide."