a friend told me about them, they're on amazon and ebay.. really cheap.... its probably a fine line from being a suppressor.... ideas???

It would be illegal to install it on your firearm AND add an oil filter AND fire a bullet through it as you would be making a suppressor with out the requisite tax stamp.

Otherwise, it's just a piece of threaded steel.

There is a fellow selling them as part of a unit that the BATFE has approved. However, you may not change the oil filter yourself; it has to go back to an 07/SOT.

George

Here is a link to a solvent trap.
http://www.ebay.com/itm/Steel-...&hash=item4ac30ab1f1
See how narrow it is? Too narrow to cover the holes that ring the threaded hole in the filter. Only a real fool would use this to attach an oil filter silencer.

Compare to the EconoCan adapter. http://www.google.com/imgres?i...=0CDgQ9QEwBA&dur=152

Big difference!

Ranb