The oil filter solvent traps are sold cheaply on Amazon. Cadiz sells their setups as NFA items. To answer the question about how anybody would now...blah, blah, blah, if you're out in the middle of nowhere, nobody would know.
If you buy the adapters from Amazon; don't pay the tax, do the form 4, etc., and shoot through the filter with no witnesses, nobody will know about that, either.
From Cadiz FAQ, both the adapter and the filters are serial #d.
"The Econo-Can Suppressor adapter part is round in shape. It also has 1/2x 28 threads and threads on to an oil filter for the purpose of shooting though the oil filter and working as a silencer. The adapter part also has the manufacturer name Cadiz Gun Works, Jewett, OH. Each Econo-Can Suppressor has a unique serial numbered that corresponds to respective the oil filter. The Econo-Can Suppressor is a NFA registered product and transfers on a form 3 to your FFL/SOT dealer. Your ATF Form 4 will transfer the registration to you."
If you buy the adapters from Amazon; don't pay the tax, do the form 4, etc., and shoot through the filter with no witnesses, nobody will know about that, either.
From Cadiz FAQ, both the adapter and the filters are serial #d.
"The Econo-Can Suppressor adapter part is round in shape. It also has 1/2x 28 threads and threads on to an oil filter for the purpose of shooting though the oil filter and working as a silencer. The adapter part also has the manufacturer name Cadiz Gun Works, Jewett, OH. Each Econo-Can Suppressor has a unique serial numbered that corresponds to respective the oil filter. The Econo-Can Suppressor is a NFA registered product and transfers on a form 3 to your FFL/SOT dealer. Your ATF Form 4 will transfer the registration to you."