Looking around on the internet it looks like if you buy a solvent trap from "over seas" like from some where like wish dot com and the department of Homeland Security confiscates them because they look like a silencer and send you a letter telling you that you narrowly avoided getting a felony and if you want it to get an approved form 1, come to Illinois and come get it... which at that point you would be in possession of a silencer in a state that bans silencers and be trying to transport it interstate. From everything I have heard and read, don't ever buy anything from wish dot com. Buy American and don't live in Illinois or Michigan. I bought a quiet bore solvent trap, laser engraved for a little under $300. There are cheaper ones, but I wanted a niceish one that's serviceable. The cheapest no moving parts serviceable commercially made 9mm silencers typically start at $400. Supposedly the eForm ones are coming back a lot faster than any type of form 4. When it comes in I'm going to do my first eform 1. So this might be a good way to get cheap silencers and a tax stamp back a lot faster than ones on a form 4.