All of our moderators are made for airguns only and marked as such. They are made with quality materials, but they are not made to withstand the intense heat and pressure present when a firearm is, well, fired. We do not use threading that is commonly used in the firearms industry and do not make adapters to connect firearm silencers to airguns or the other way around. It would not be safe to connect one of our moderators to a firearm.
The only state I know of that views an airgun as a firearm is NJ. In that state you have to get license to purchase a firearm and we cannot ship there.