Buy an oil filter to rifle barrel adapter here:
Don’t forget to buy a filter with the matching threads.
Here is a filter that would have the 13/16 – 16 threading:
Here is another filter with the 3/4 – 16 threading:
There are many more than you can choose from, just make sure you match the threads.
Some people like to use a Solvent Trap Washer:
And now to our story…
It’s not an urban (or is it “rural legend” in this case) legend, and you can see for yourself in the videos. The thing not only suppresses sound, but it also allows the shooter to accurately and reliably fire his gun and hit the intended target.
Hickok45 demonstrates oil filter suppressor
“Econo-Can Oil filter Suppressor (Adapter) Demonstration
Of course, you will need to pay the $200 tax stamp if you want to be legal.
Some people don’t believe the Second Amendment permits federal regulation of suppressors and will never pay $200 for a tax stamp. Those people may be at risk of violating the law if they attempt to suppress their firearms without the proper paperwork, etc.
However, much like the idea behind the 3-D printer plastic gun blueprints (recently banned by the US State department,) anyone with a blueprint and a machine can make a part regardless of the law. Just like a car is capable of breaking the speed limit, the law doesn’t change the reality that the law may be broken. It is obviously possible to make a cheap and simple adapter that fits a threaded barrel to an oil filter. In fact there are a few of them available on Amazon for use as adapters for oil filter “solvent traps.” When combined with an oil filter this solvent trap is not intended to be used as a suppressor, but as a trap to catch cleaning solvents that may otherwise leak out of the barrel during cleaning and harm the environment.
So practically speaking, anyone with the right machine can make and sell this adapter legally, as you can see on the Amazon links above. Of course different threads require different adapters and filters. For example, it appears from our research that the AR-15 uses a 13/16 – 16 thread, while the .22LR models use a 3/4-16 thread. Although this can vary depending on how the adapter was manufactured, so if you want to buy one to use as a solvent trap make sure you match your threads or it won’t work. Also, some adapter designs reportedly work better than others. Since they are so cheap, you may want to buy a few and try each one out. If one works better than others at creating a tight seal, we’d love to hear about it. Some reviewers on other pages suggest using these adapters with a washer and gasket to make the perfect seal. They last thing you would want is to have a leak and let some solvent out that could have been contained.
We do not offer legal advice other than to say that it is never wise to break the law. It’s even less wise to record or document yourself breaking the law. Hickok45 had his legal paperwork in order, you can bet.
Anyway, the oil filter suppressor does appear to work as a low-cost alternative to the $1000 suppressors in the market today. If you do decide to get an “econo-can” we’d like to hear about your experience with it. We’d especially like to hear how it and the oil filter hold up after a few hundred rounds of 5.56.