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Buy an oil filter to rifle barrel adapter here:

1/2-28 to 13/16-16 filter thread adapter

10/22 to 3/4-16 filter thread adapter with set screw

unthreaded barrel adapter

Use this adapter to convert your 22LR barrel from unthreaded to threaded.

Don’t forget to buy a filter with the matching threads.

Here is a filter that would have the 13/16 – 16 threading:

Fram PH373 Passenger Car Oil Filter

Here is another filter with the 3/4 – 16 threading:

Fram PH3569 Extra Guard Passenger Car Spin-On Oil Filter (Pack of 2)

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:

2″ Solvent Trap Washer – Stainless Steel for Solvent Trap Adapter


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.


  1. Hello All, I need some help! I am looking for a adapter for my Savage 62 .22LR . I am in the process of setting up my Gun Trust to by my suppressor but do not want to thread the barrel nor by a new one. I am looking for to be 1/2-28. I found them on line for Ruger 10/22 and seem lots of photo but do not seem to find one that states it is or will fit that Savage 62 .22LR. Any one have some advise or know where I can purchase one in the USA.


  2. Pingback: A 'phenomenal' solvet trap project.

  3. Well, lookit, in states where suppressors are legal, you can order and possess the adapter, but you’d better fill out the Form 1 (to “manufacture” the suppressor), send it in with your $200, and wait the 8 months to get your tax stamp back, before screwing said adapter to the filter, and *certainly* before screwing that assembly (the manufactured suppressor) onto your firearm. Still, $20 for adapter+can, and $200 for stamp, for a total of $220, is an economy suppression route to take, any way you slice it. Wonder if there’s a 5/8-24 to 13/16-16 adapter as well…


  4. 22 savage mark 2 what size should I get would like to have one with The set screw any ideas


  5. The question here is. “Is $200 plus some paperwork worth several years in prison, and feel like a ….female,+ lots of fines?” I’d have to say Naaa. Be smart people!


  6. I want to do this to my nagant revolver but I need to thread the barrel 1st. what I need to know is which die to use. Is the adapter linked to above reversed threaded (for the thread connecting to the barrel)?


  7. Besides threading the filter onto the barrel is there anything else you would need to do to suppress a gun? Dose there need to be oil in it? Dose there have to be a washer on the back side of the filter between the gun and filter? Thank you for the info !


  8. Where can I find an adapter for a 300 win mag and a 270


    • Your best bet is to search on Ebay, as they seem to have a wider selection than Amazon. Amazon tends to remove these listings while Ebay couldn’t care less.


  9. For $200, it’s worth the peace of mind… IMO, it’s a form of control and taxation.


    • And the added beauty (for the government) in filing the paperwork and paying for the $200 Tax Stamp is that Big Brother now knows who you are and where you are so that when (they) decide to confiscate all weapons, it’ll make things a little easier for them. After all, you wouldn’t go to all that problem and expense, if you didn’t own a weapon now, would you?
      Of course, if you’re wanting to use your “Solvent Trap” out in a public arena, you better have a Tax Stamp (which must be more specific of a FFL Class 3 device than “oil filter barrel adapter), or you are committing a Felony.


  10. question-would this work on a bigger caliber rifle?


  11. I’m sorry, I miss spelled mossberg 22 lr. And it’s the 702 not a 705.


  12. Where can I buy one to fit my mossier 702 22lr?


  13. dumb ass dildo breath

    Dude, check your facts. How the hell can anyone who is trying to be an authority on this say that the AR-15 uses a 13/16-16 thread? Wow. That’s painful.


    • The reference is not to the thread on the barrel of the AR-15, but to the thread on the oil filter/adapter that goes on the AR’s threads.


    • dumb ass dildo breath … the 13/16-16 thread is the OTHER END of the adapter that threads into the filter. Damn! Get your parent’s permission before you use the Internet!


  14. Pingback: Stainless Solvent Trap 1/2-28 3/4-16 Thread Oil Filter Adapter | Complete Automotive

  15. Thank you for all that you guys do we appreciate you very much!


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