Isn't the Katana just a Discovery with the Maurader stock ?If that is the case, I would stay away from it, the stock is horrible.
The stock is much like the Marauder stock, but having the Marauder trigger is the real plus. At least the one I've seen in real life looked like the stock was inletted with a whole lot of space (almost like it was made for the fatter marauder air tube), but at least it's a man-sized stock. The bigger, better shaped stock and a Marauder trigger are worth getting.Besides the trigger and stock, it's pretty much a Discovery, so whatever tuning/power reviews for the Discovery will apply to the Katana. Small tube and a 2K fill are not going to give high energy levels for a whole lot of shots. If major power is a goal, would pass on the Katana (or the Discovery). They seem to give the best combination of power and shot count somewhere around 18 foot pounds. Can ramp them up to +20 foot pounds or dial them down to 12-15 foot pounds with the mods posted on this (and other) forums... but they seem to give the best combination of shot count and power at about 18 foot pounds.