Altaros Regulator Overpressurized

I recently put an Altaros regulator on my Daystate Air Ranger. It worked beautifully until...

I refilled the gun this morning and used the old fill port instead of the new one before the reg. Long story short 4500 psi directly into the regulated side of the gun = no regulation. Now the gun works as it did before the reg was installed.

Can the reg be rebuilt? Hoping someone has some experience with these regs.