oil filter suppressor issue

[grasshopperglock]

If anybody is using the oil filter suppressor there's a issue that will effect accuracy and sound.

If you look up construction of the filter you'll notice that its a paper element inside a metal housing. That just hangs from the base end.

Now here's the problem. The filter isn't attached to the end where the bullet exits. After one shot the hole is dead center in both the filter base and outside canaster. However, the filter base inside moves around.

So before you pop the first hole through the filter. Run two or three screws through the end of the outside canaster to hold the inside filter base in place. Otherwise, bullet strikes from the inside filter base jiggling around will happen.

The screws have no impact on sound. Nor do they leak gas.

 

[SidewaysTA]

Uh?

Thanks?

 

[TexasRedneck]

Sorry....but jury-rigging at that level is, IMO, nothing more than a HUGE accident waiting to blow up in your face.

 

[tad]

who the hell even jacks around with that kinda crap?? I think most people here have enough sense and enough stamps to know better than to risk

 

[TexasRedneck]

Well, now easy there, Chiefy!<G> I can see where folks wantin' to play around with stuff might do so - for me, there's too many questions (is the adapter the suppression device, or the filter - because if it's the filter, you'll have to get a new stamp every time you replace it - an' they don't last many rounds, I'm bettin'.

I CAN see where someone on a remote ranch might set one up just for grins.....me, ah'm too paranoid to do so without havin' all the "I'"'s dotted an' "T"'s crossed!

 

[Acesn8's]

more info here

AmericanSpecialtyAmmo.com


http://www.texasguntalk.com/forums/class-iii-nfa/34932-i-like-little-redneck-my-ar.html

 

[TexasRedneck]

Well, that addresses the registration question - guess it's one of those "well, why not?" things....

 

[Acera]

TR I think the adapter is the device you get the stamp for, the oil filter is an expendable and replaceable part. Any decent machine shop would make on for you without any questions asked for a lot less than what they charge. Just tell em' it's a part for the hot-rod you are building. Legally and ethically that is a whole different discussion, LOL.

 

[TexasRedneck]

True - but if ATF pops you on it an' you roll over on the machine shop that did the work, I'd doubt you'd want to meet up w/'em again.....lol!!

 

[deemus]

Machine shop: "that bastard told me it was for a race car?!?!?!? I don't make stuff for guns officer. That shit's too precise and complicated...".

 

[grasshopperglock]

Regardless of the opinions on an oil filter suppressor.

They work surprisingly well. There's no sight issue on a sig522. The adapter is way over priced for a machined "nut" worth less then $20.. But SO is the crappy tax.

If it had baffles and if they wore out.....I couldnt just go to auto zone. Since it has no baffles.......

As for them exploding. Catching fire. Or voting for Obama. I've shot many a round of 22 through fram and STP filters. Not a problem. Just make sure you run some screws though the end to keep the guts centered.

 

[M. Sage]

I don't see why the media should shift, it's usually secured out toward the sides, where the media is.

 

[SidewaysTA]

Well that's a new one for me. Heard of using coke bottles before. Never heard of people using oil filters.

If you use used filters does the oil saturated element suppress even better than a new filter?

 

[TexasRedneck]

Used filters might muffle it better.....an' the meat would be pre-lubed fer the griddle!

 

[deemus]

Used filters might muffle it better.....an' the meat would be pre-lubed fer the griddle!

[Snicker]

 

[SIG_Fiend]

*Edited* Sorry Grasshopperglock, jumped the gun. Didn't realize this was a legal NFA device before I locked it.

 

[grasshopperglock]

I don't see why the media should shift, it's usually secured out toward the sides, where the media is.

The metal disk at the end of the element is what shifts. I noticed that the hole had been struck off center.
This was the fram. I was able to move the disk around using a punch. I then popped it on the table and the bump also moved the disk.

Same thing with the s383 STP.

 

[grasshopperglock]

Well that's a new one for me. Heard of using coke bottles before. Never heard of people using oil filters.

If you use used filters does the oil saturated element suppress even better than a new filter?

Yep. I usually pour a little oil in the new filter. Just to the point where it begins/stops dripping out the filter. WD40 works also. I've heard you can use water too. But you get a lot of back pressure and I'd figure water vapor would come back into the barrel.

 

[scap99]

Yep. I usually pour a little oil in the new filter. Just to the point where it begins/stops dripping out the filter. WD40 works also. I've heard you can use water too. But you get a lot of back pressure and I'd figure water vapor would come back into the barrel.

Ever set one on fire, yet?

I don't think I'd have the guts to put that much heat/sparks through something flammable that was attached to the end of something I valued.

 

[grasshopperglock]

Ever set one on fire, yet?

I don't think I'd have the guts to put that much heat/sparks through something flammable that was attached to the end of something I valued.

Me neither......however...

I wouldnt mount the thing on a 300win mag. It does just fine on a 22. Ive cut the STP open after 553rds. Ammo used was a mix of Win 333, REM Subsonic, CCI quite. The filter element showed NO signs of being burnt. Just lots of powder marks. This filter was ran with new syn blend motor oil. No swelling. No inner parts tearing apart. Rifle used is a Sig 522. 16" barrel. None of the above ammo failed to cycle the action.

Anyway,

After some testing, I found very little sound reduction between the STP 2qt and the Fram 1qt. The Fram filter was ran with WD40, then syn blend motor oil, and finally washed out and ran with tap water.

Pros for the Fram:The fram is way lighter. Cheaper. Chinamart has it in stock. About $4. Seemed to have less back pressure. I had to clean the barrel less with the fram over the STP.

Cons for Fram: First shot burn up the O2 is loud. Really loud.

STP Pros: The sound out of the STP is more of a lower tone. The Fram gives you a higher tone(after the first shot). More of a bell ring then STP. First shot burn up the O2 on the STP was alot lower the the first shot Fram.

STP cons: Its huge and heavy. It also appeared to have more back pressure. The famous unburnt 22 powder seemed to get more in the action and barrel vs the Fram. Chinamart doesn't sell them. Its around $8 at Autozone. (They bring out a dusty box and make the comment, "Thats a big filter, we don't sell many")

The CCI quite's .......good Lord. Snap your fingers. Thats the sound it makes with the Fram. And not a hard snap either. The REM subsonics, excluding the one in the bunch that gos supersonic, IMO sounds close to a empty pellet rifle. The WIN 333 bulk makes a pop a hair louder then REM subs, but the sonic boom snaps out front away from the rifle. Kinda weird sounding, but cool all the same.