Please follow all NFA laws. Modification in any way of dry storage cups without an approved tax stamp could be considered a felony. If you require a silencer, suppressor, or any similar device, please choose a licensed dealer such as SilencerCo. Attempting to modify solvent traps for these purposes is https://solvent-traps20853.cosmicwiki.com/951216/immer_meine_solvent_trap_cups_um_zu_arbeiten