Well I do not have much knowledge off the huben, but the AMP reg and huma regs are almost identical. Regarding the piston, and seat, I would believe it is the same design as on 80-90 persentage off all other guns. Some might use other springs than the washers, but the washer design is very common. When I mentioned about comparing owners, I meant not you specifically, but all the thousands off other owners. The reg on a impact is easy to damage, if you screw it in the wrong way, or doeas not follow the right procedure. The more times you adjust it, the greater the chance it is that you forgot doing it the right way.
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