More a heads-up than anything: BATFE is now going after solvent traps. https://www.atf.gov/firearms/docs/o...023-openletter-solventtrapdevicespdf/download
It's exactly what I expected, and the reason I have never had a solvent trap. Too much risk for too little benefit, IMHO."Solvent traps", oil filters, soda bottle adapters; bump stocks, "braces", 'Shockwave', all gimmicks to get the effect of highly regulated equipment without government control. What did you expect?
They did. They went after the company making them, harassed the customers and confiscated a few traps from people.I think they went after them a few years ago too.