A stab would work but a volumizer might be the way to go. Any blowback gun or a gun that uses a hammer can be quite pressure sensitive. Will a stab or sidewinder work yeah but you would be spending almost what you bought the gun for a reg. To me it doesnt make much sense. But if your looking for consitency a volumizer might do the trick because its not like your going to be shooting faster then 5 or so bps so as for consistency from the tank reg you should be fine and shouldnt see much drop off in consitensy. Ive always belived that anything +/- 5 is very fine.