One of the reasons why I try to talk people out of regulating an unregulated gun. Not only is the gun set up to open at full pressure meaning the hammer is probably too heavy and valve return spring to light but also usually needs a different hammer spring to actually perform at the intended tune. In addition you're not only adding multiple more places to leak with all the extra orings but even the factory Huma gauge can leak. Multiple teardown and oring swaps to try and fix a leak I couldn't find. Spraying all oring connections and fitting threads showed nothing. Turns out it's leaking through the gauge and out the weep hole.