regulator for Hatsan Gladius

As far as I know the different brands of regulators are "in air tube" installed. Have you already tried the JB WELD plug them 2 out of 4 holes on those cylinder trick yet? You may not necessarily need to buy regulators to get acceptable shot strings. I Would think you would need one that is custom made for what I am thinking you are thinking of thinking what you want to accomplish but wouldn't know how you would be able to unscrew the AIR CYLINDERS to refill if you were able to have an external in line regulator made. Yo!