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Sound Moderator

by vik, published

Sound Moderator by vik Mar 3, 2011

Featured Thing!

Description

Despite what you see in the spy movies, what people call a "silencer" can't really be done in any size smaller than a beer bottle. Printed on normal 3D printers, this is a sound moderator: It won't eliminate the sound of an airgun firing, but will cut out the sharp "crack" that makes birds fly off and wives complain from the study.

It works by allowing the excess gas from the barrel to expand slowly in a series of chambers, shown in the cutaway image. If you use this with a firearm you will probably melt it.

Recent Comments

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I stand back and watch with infinite amusement as the US Government makes a complete idiot out of itself online again. I don't even know what ITAR stands for and I don't think I care. If anyone wants these files and the US gets shirty, just download them from mega.co.nz

Vik, I think you'll be highly amused to know that this is one of the designs that the US State Department demanded be taken down from the defcad.org site earlier today for ITAR review. It seems they didn't realize that the design itself was essentially 'imported' from NZ in the first place!

So, um, are your ITAR fees paid up? :-)

Not impressed of the sound moderation from a paintball marker. but just for looks its awsome.

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License

GNU - GPL
Sound Moderator by vik is licensed under the GNU - GPL license.

Give a Shout Out

If you print this Thing and display it in public proudly give attribution by printing and displaying this tag. Print Thing Tag

Instructions

Adjust barrel diameter and calibre settings in SCAD file, print, fasten to airgun barrel with stainless steel hose clamp. Supplied STL is for a 12mm diameter barrel in 5.56mm (.22) calibre.

Apply standard firearm safety practices when aligning the moderator with the centre of the barrel. i.e. don't look down the bloody thing when it is loaded!

If your 3D printer has a lot of headroom, enable the 4th segment in the SCAD file.

Comments

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vik on May 10, 2013 said:

I stand back and watch with infinite amusement as the US Government makes a complete idiot out of itself online again. I don't even know what ITAR stands for and I don't think I care. If anyone wants these files and the US gets shirty, just download them from mega.co.nz

HaveBlue on May 9, 2013 said:

Vik, I think you'll be highly amused to know that this is one of the designs that the US State Department demanded be taken down from the defcad.org site earlier today for ITAR review. It seems they didn't realize that the design itself was essentially 'imported' from NZ in the first place!

So, um, are your ITAR fees paid up? :-)

lobster2b on Oct 4, 2012 said:

Not impressed of the sound moderation from a paintball marker. but just for looks its awsome.

NETio on Jan 29, 2012 said:

So many of the comments here contain misinformation.

1. In the United States of America, the BATF does not regulate airguns are they are not considered firearms. That means a suppressor for an airgun is perfectly legal (thus why many higher end airguns come with suppressors).

2. It's true that if you printed our a .22 caliber suppressor and possess
ed a .22 caliber firearm, the BATF could charge you with constructive intent (even if you never mounted the suppressor on the gun). The likelihood that such a charge would stand up in court is really negligible in my opinion (please note: I'm not a lawyer).

The ONLY documented cases I could find
were of a .44 caliber suppressor shipped in the mail, and one case of a convicted felon mailing a metal .22 suppressor with an airgun (the real prosecution came after a search that resulted in them finding multiple books regarding the machining of suppressed machine guns). I'm not sure how the first
case worked out, but it's worth noting it was a fiber-filled suppressor that was in fact only good for a one-shot test done on a .22 Ruger handgun. The case involving the felon resulted in a conviction.

To summarize: there are hundreds of air rifles in the US that are sold with sound suppressors o
n them or are fitted with them. In comparison, there have been two documented cases of prosecution for airgun suppressors (both of large-caliber, metal design).

I personally plan to modify this thing (I'll share, don't worry) to have varied size chambers (same-size chambers cancel the same frequenc
ies and are generally ineffective) and print it for my .177 caliber Crossman Storm XT. Seeing as how I don't own any .177 caliber firearms I'm not worried about litigation by the BATF. If I was approached by the BATF, I'd make press the point that they don't prosecute people that possess potatoes or
pillows, both of which are probably better at suppressing a real firearm.

Noobman on Sep 29, 2011 said:

Thanks to all posts warning about the legal aspects of silencers. I guess on my mother-in-law i will just have to use a pillow instead ... :-D ... brb!

ftc on Mar 4, 2011 said:

This is a great object, it shows the principles of sound deadening. I would love to see someone modify it into a muffler of some sort (perhaps for an air motor so it doesn't melt). After spending so much time trying to find the quietest muffler for my bike I suspect tuning isn't an easy problem.

hintss on May 7, 2011 said:

mufflers in exhaust systems typically send the sound at itself, canceling it.

vik on Mar 4, 2011 said:

OK, let's answer some of the posts. Yes, I made it up myself. The concept of multiple chambers is ages old though; I sloped one face to make it printable.

I'm not in the US and no longer travel through it, and am therefore not constrained by its laws. But, seeing as this is (a) a moderator and not a silencer, and (b) will be destroyed by fixing it on a firearm, I can't really see a problem. Besides, an empty plastic coke bottle filled with scrunched
toilet paper is a much more effective silencer for firearms so I can't really see anyone objecting to this more complex design.

Oh yes, if you own an airgun that fires supersonic lightweight alloy pellets, this won't do anything to stop the sonic boom!

zgbot on Mar 4, 2011 said:

i am not opposed to it or have any problems with it, just wanted people to know that in the US, manufacturing a silencer/suppressor or anything that will reduce the report of a firearm even .5% (even if its a coke bottle taped to the front) is a serious felony unless you pay the fees and do the paperwork and pass the background check.

the penalties for manufacturing a silencer in the USA is 5 years to life, and or up to $5,000,000 fine.

better to know than not to know

zgbot on Mar 3, 2011 said:

just a heads up to anyone that might make this. if it fits on a real rifle or handgun that you own (in addition to the airgun it is for) and you live in america, the BATF considers it manufacturing a silencer (if it works or not) many states in america allow silencers, even manufacturing your own but there is a lot of paperwork involved. this is one area that you don't want to mess around with if you don't know what you are doing. i know it most likely wont work on a real gun and could easily kill the person firing the weapon when it explodes. it will surely work for airguns etc. if you live in a state that does not allow suppressors i wouldn't even download this.

ftc on Mar 3, 2011 said:

This comment reminds me of Baris's perfect home made silencer in A Scanner Darkly, made mostly out of aluminium foil and electrical tape. I would imagine it would be quite comical to watch the result of trying to use it on a real firearm. (queue up the Mythbusters bullet proof test chamber)

eagleapex on Mar 3, 2011 said:

A very unique problem that 3D printing easily solves. Well done!

jballard on Mar 3, 2011 said:

This was on my list of things to design, thanks!

stu on Mar 3, 2011 said:

Derp weapons.

jk, this looks like a cool design. Is it something you thought up or was it referenced from a previous design?

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