Oil Filter Suppressor

The adapter is available – HERE (bottom of page)

$55 gets you the adapter which is the part you register with the ATF according to the website.  The oil filter is considered the removable expansion chamber.

Pretty cool as a novelty. Unfortunately there doesn’t appear to be any videos on YouTube of people using one of these things.

It’s too bad there wasn’t more specs on how to use it, and noise reduction info on the website.

It would be funny if the same company came out with a set of EXTREME hi-rise sights especially for this application. LOL



adam September 3, 2010 at 01:56 am

looks like a AN fitting (from any performance auto store) with the same thread size as the oil filter (testing would lead you to find the best size filter to use) on one end, the other threads does not matter much as long as the id of the non filter threaded end can be bored or drilled to accommodate a .500×28 tap through it.

Admin (Mike) September 3, 2010 at 02:39 am

I just googled it, and holy that does look like an AN fitting. I wonder if that company is just flipping a few dollar perfectly legal part for $55 because of the context it will be used.

adam September 3, 2010 at 01:57 pm

it is and they are. lol i used them all the time when doing fuel systems and dry sump oil systems.

adam September 3, 2010 at 01:58 am

i should add all NFA rules apply ;)

mikee September 3, 2010 at 08:00 am

I await the testing on various brands of oil filters, to determine which suppresses noise best. Fram? Cheap, cheap, cheap.

Admin (Mike) September 3, 2010 at 05:48 pm

You first Mikee :P I’ll feature your writeup on the blog.

CinSC September 3, 2010 at 08:42 am

I’ve gotta try this!

The filter/suppressor reminds me of this: http://www.thefirearmblog.com/blog/2009/10/16/worlds-largest-gun-suppressor/

Admin (Mike) September 3, 2010 at 05:49 pm

holy that large suppressor is intense!

Bill September 3, 2010 at 12:28 pm

Wow – need some tall sights. POA=POI? Hahah.

Admin (Mike) September 3, 2010 at 05:50 pm

hehe yea. Someone needs to come up with a custom holster for this thing too!

Josh September 3, 2010 at 06:04 pm

Another acronym that might be appropriate to describe this overall concept: POS. Maybe I’m just being a Negative Nancy for overlooking the joy of doing something just because it can be done, but this doesn’t seem very useful. It looks like a good way to get a face full of used oil (the filter in the picture doesn’t look new). Wouldn’t be worth the $55+200 to me anyway!

Admin (Mike) September 4, 2010 at 02:44 am

POS = Peaceful Oily Suppression ? :P

For some reason I figured they would be using new oil filters, but I guess you could maybe go used and and get the same db reduction.

Josh September 4, 2010 at 09:49 am

Peaceful Oily Suppression… Touché Mike, touché.

It looks like a used filter to me. I don’t know exactly how they work, but they’ve got those holes in the top… But, it is just for a .22, so maybe there’s so much room in the filter that it can expand all the gases without worry of enough pressure to blow anything back out. Still seems kind of pointless to me; what’s the fun of shooting if you can’t aim at your target?

joe October 13, 2012 at 03:38 am

when your up close and personal!!!! that real fun..

JonMac September 3, 2010 at 01:39 pm

There’s mention of a suppressor made using an oil filter in the AFTE Journal vol42 no.3 Summer 2010 (piece by Luke Haag). If I read correctly, it was the best of the bunch tested by them, and affords perhaps a 15db reduction in report from a 9mm.

Admin (Mike) September 3, 2010 at 05:50 pm

That’s pretty cool. This is probably a dumb question, but I wonder if people run them wet or strictly dry?

M Gallo September 3, 2010 at 05:44 pm

A -8AN line is .500″ ID.

Admin (Mike) September 3, 2010 at 05:47 pm

cool, I wonder if it’s the required 28 TPI?

Perturbo September 4, 2010 at 11:57 pm

My attitude is if its stupid and it works, its not stupid.

Admin (Mike) September 9, 2010 at 01:07 am

Yea that sums up how I feel too.

Stupid would be those screw on “fake” suppressors that are just a piece of threaded bar stock made to look like a suppressor but actually only ad weight.

MJM September 8, 2010 at 06:28 am


FRAM-FRAM—-FRAM = two to the chest, head shot
Couldn’t resist.

Admin (Mike) September 9, 2010 at 01:06 am

hahah nice

Glockmeister October 9, 2011 at 05:29 pm

After market threaded barrel..135.00..an adapter.. 3.50.. filter,,4.00 .. shoots great with Glock 23. Not silent, but is quiet.

Tyler June 2, 2015 at 07:35 pm

What size adapter for glock 23?

borg October 16, 2012 at 01:49 pm

Will it work for a .45

zach January 20, 2013 at 11:51 pm
geeknik October 22, 2013 at 04:08 pm

Something like this would fit on an AR-15 w/ a removable flash suppressor: http://goo.gl/E5wxUP. And if you were to add a FRAM filter to it, could possibly lower the sound output of the AR-15 by 20dB or so… Not that I would know from experience, just what I’ve been told. Use caution though because this same person told me that the back pressure can lock up the action on the AR-15 and you’ll have a fun time getting it unjammed. Good for one shot only, depending on your ammo. Might be more suited for bolt action rifle.

grunt December 6, 2017 at 04:28 pm

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