As long as the suppressor is an integral part of the weapon it is legal to sell. Same as a powder burner. if the suppressor is welded/permanently attached to the weapon you can purchase the whole package w/o the tax stamp. That's how Gamo can get away with selling the weapon with the suppressor attached. Plus there is a fine line between suppression and changing the pitch of the sound waves after discharge. With the Marauder the baffle system is part of the shroud which is integral/designed into the weapon. BUT if you add/remove or reshape any of the baffles then you've just committed a felony. Stupid isn't it? That's how Neal Clague and TKO get around the law. By changing the pitch of the weapons report. Not necessarily reduce the SPL of the discharge.