Spare parts of a silencer are considered a silencer. You may not keep spare parts laying around. If you have built a suppressor (AKA silencer) on a form 1 you can only make replacement parts as needed. This is nothing new. Also anything used to suppress the noise of a firearm is a silencer. It doesn't have to be particularly efficient. If it lowers the sound level by one db. it's regulated by the national Firearms Act of 1934. It doesn't matter if it is a soda pop bottle, a potato or whatever it is, it becomes a silencer if it is attached to the muzzle or a firearm. That isn't a new thing either though.
Personally, I have several suppressors (known to the ATF as silencers) and none of them have any copper mesh or anything of the sort in them. That is so old school, because it needs a lot of maintenance to maintain any degree of efficiency at all. No chore boy pads or pipe insulation in mine to will ever need replacement.
This post is strictly for information purposes only and not intended to interfere with panic, hysteria or nail biting by those so inclined