Oil filter suppressors have been around for a while. I saw something similar 30 years ago. $200 is a little high for that thing. If I was going to pay the $200 tax stamp, I would get a real silencer.
Still, its only a .22LR, not sure I wanna lose all ability to really aim and adding a ton of weight to the end of the gun to make it a little less noisy.
Yeah, oil filter adapter to make a sorta crude suppressor, threads onto the barrel and the .22LR penetrates the top dome of the can on its way down range.
The company that makes that adapter also has a video where they shoot an AK-47 in full auto with an oil filter suppressor. It worked really well. Mostly just heard the "clack, clack, clack..." of the action cycling as it was firing. Pretty neat.
Thing is, you cannot replace the oil filter. The adapter and filter are serialized. If replacing the filter, you would be altering the suppressor and would be in violation of federal law.
I can't see what it is,but if it's the threaded adapter to screw on a filter onto a barell,it is very illegal in most states.Just having that adapter will get you in serious trouble.IF it's the one i'm thinking of.