Instructables
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Well, I basically took this idea and ran with it.
http://www.instructables.com/id/Make-a-silencer-for-MOST-paintball-gunsmarkers/
I updated it and fixed where he left off. It works well and its fairly light depending on what kind of PVC you use.

Step 1: THE GOODS

*1* Pocket knife

*2* PVC slightly larger than your barrel

*3* PVC 1" larger than your barrel

*4* 2 PVC reducers that fit your PVC

*5* Drill with a dremel bit

*6* Paintball marker

*7* Cotton balls

*8* Black plastic spray paint

*9* Sand paper

*10* Hammer

*11* PVC cutter

*12* Hacksaw

Step 3: ASSEMBLING (part 2)

Picture of ASSEMBLING (part 2)
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Firmly grasp your PVC Cutter and begin cutting the tube about 1" from the reducer. Make sure it is as straight as it can be, if not it will affect your accuracy.

Step 4: ASSEMBLING (part 3)

Take the drill and equip the smallest bit possible. Now, take the pipe and remove it from the reducer. Next, CAREFULLY drill about ten holes in a straight line, twist the PVC and repeat. Do this about six times.

*as I said before, be very careful when making the holes, our bit broke and sent a tiny peice of metal hurdling towards me and stuck in my arm.*

Step 5: SANDING

Take your sandpaper and wrap it around a stick. Shove the pipe over it. Move the stick up and down thus sanding the inside of the pipe.

Step 7: Stuffing

Picture of Stuffing
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Take about 20 cotton balls and tear them in half. Then shove them between the two pipes by any means necessary.
rotinom6 years ago
Just as an FYI, if you live in the US, these are (generally) not permitted. You'll need to get a Class 3 tax stamp, pay $250 to register it, get permission from your local police department, etc.. This is because it is essentially no different from a silencer for a real firearm. Just something to be aware of, because it's a federal crime. Felony. Bad business all around. Otherwise, nice work. I'm assuming that the PVC pieces were not glued together, because otherwise splatter & everything would be a royal pain to get out. Also, you'll need to replace the cotton balls every so often. You may want to try very fine mesh steel or stainless steel wool, and check the performance. It'll be a bit more durable, but you will have the rust issue to contend with.
120012 rotinom4 years ago
 exactlly : FIREARM is considered anything that uses a primer and a flammable source to push a object out of a barrel like an air rifle they have silencers that work on them but no tax stamp. SO THERE FORE THIS IS LEGAL.
iriyejm 1200124 years ago
Sorry; It's the device not the "weapon" it's attached to.
possession of the silencer it's self is the element of the crime.
BOXHARD rotinom6 years ago
Another thing to try would be stolen from auto muffler designs... fiberglass.... I really like the build though, nice idea. I may build one to play around with... I would think this would be considered more of a novelty though wouldn't it? I mean do ya really think ya need to register a pvc paint ball silencer? I don't know, just makes me wonder though...
rotinom BOXHARD6 years ago
I like the fiberglass idea. I do know that commercial firearms silencers use a metal mesh, like steel wool. They also have "wet" silencers which use grease, mixed with the muffling material, and are typically smaller in size than the "dry" silencers. For those who may legally do so, check out traditional silencer design for ideas.
rotinom BOXHARD6 years ago
Unfortunately no. Search the internet for "paintball silencer" and you'll find forums who forbid talking about it, and lots of discussion on the fact. Sad, but true. I believe the tippman (a paintball marker manufacturer) has banned mention of them in their forums, just for that reason.

Found this, which is further discussion on PB silencers: http://www.scribd.com/doc/357071/atf-ruling20054

Kids, don't go to jail :-)
naw14835 years ago
I want to know how you attach the suppressor to your paintball barrel so that it lines up and does not kill the accuracy of the marker? It looks like if it was bumped or jarred even a little it would not stay in alignment.
MrAngryPants (author)  naw14835 years ago
Well, at almost the end of my barrel, there is about two inches of barrel that is bigger than the other parts. Its kinda hard to explain, but it looks like * and fits very well on that piece.

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Rolla6 years ago
didn't work 4 me at all
slimguy3796 years ago
I made one of these but I think its to front heavy but hey if it works for you thats all that matters