Whether items such as inline fuel filters and firearms solvent traps can qualify as 'firearms silencers' or 'firearm mufflers' under the National Firearms Act when the items are not marketed as silencers and have not actually been used to silence or muffle a firearm?

QUESTIONS PRESENTED I. Whether items such as inline fuel filters and firearms solvent traps, which might be able to function to muffle or silence the report of a firearm, can qualify as “firearms silencers” or “firearm mufflers” under the National Firearms Act when the items are not marketed as silencers and have not actually been used to silence or muffle a firearm? I. Whether the Second Amendment prohibits any laws that foreclose law-abiding citizens with ordinary self-defense needs from possessing items that serve as firearm mufflers or silencers? ii