I don't think the Valken is designed for 300psi input. More like 160psi.
Looks like pieced together kit with a SMC copied industrial reg that is designed for 160psi input from a industrial compressor. Possibly max input is 200psi rated. It also does not have overpressure protection.
Both Ninja and Redline are airsoft specific with overpressure protection and a proper tourney lock.
Last edited by SuperHog; August 6th, 2015 at 16:45..