The Airgun Regulator is the same as regulator for rifles gunpower, the only change is that in the package is also nylon spacer ring, which is used in the case when gauge and filling pin is not in good position. It is a simple installation without adjustments on rifle, so everything can be returned back. All you need to do is unscrew the bottle from airgun body (before screwing launch air). Then screw regulator between the bottle and airgun body. After installing the regulator NEVER fill by quick fill on the airgun, only by quick fill on regulator. For the filling you must purchase paintball coupling, which is the same as gun marauder or more. Do not use pin as lever for tightening regulator. For that is added screw in spare O-rings.