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Posted: 8/20/2021 1:34:52 PM EDT
Came across this marvelously shady ad from 80's Cobray:
 Closer view:  Now to my eye, it looks like they're using a Soda 'PreForm' tube as the suppressor body, which is frankly pretty ingenious. The tubes are the ~size of a .22lr suppressor, and very durable. Tubes are ~5"x1," and use the thread pattern of a soda bottle.  https://www.homesciencetools.com/product/giant-test-tubes-60-pack/ The baffles on the Cobray look to be some mix of rubber washers and foam? Does anyone have any more info on this bit of 80's nostalgia? |
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Posted: 8/20/2021 1:46:51 PM EDT
[#1]
Sigh, now I need to order some and do sime testing.
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Posted: 8/20/2021 2:04:42 PM EDT
[#2]
The "baffles" in the old SWD HE .22 cans, and the disposable unit pictured, consisted of rubber wipes placed between short "tubes" made of compressed bronze wool
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Posted: 8/20/2021 2:09:32 PM EDT
[#3]
Quote HistoryQuoted: The "baffles" in the old SWD HE .22 cans, and the disposable unit pictured, consisted of rubber wipes placed between short "tubes" made of compressed bronze wool Awesome. Gonna cobble some together when the parts arrive. |
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Posted: 8/20/2021 2:50:35 PM EDT
[#4]
Quote HistoryQuoted: The "baffles" in the old SWD HE .22 cans, and the disposable unit pictured, consisted of rubber wipes placed between short "tubes" made of compressed bronze wool Excellent, thank you. 80's really were a marvelous time it seems 
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Posted: 8/20/2021 2:52:10 PM EDT
[#5]
Quote HistoryQuoted: Awesome. Gonna cobble some together when the parts arrive. Quote HistoryQuoted: Quoted: The "baffles" in the old SWD HE .22 cans, and the disposable unit pictured, consisted of rubber wipes placed between short "tubes" made of compressed bronze wool Awesome. Gonna cobble some together when the parts arrive. Nice, please let us know how it turned out. It would be funny if these QT's made a comeback. |
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Posted: 8/20/2021 3:04:23 PM EDT
[#6]
Quote HistoryQuoted: Excellent, thank you. 80's really were a marvelous time it seems Quote HistoryQuoted: Quoted: The "baffles" in the old SWD HE .22 cans, and the disposable unit pictured, consisted of rubber wipes placed between short "tubes" made of compressed bronze wool Excellent, thank you. 80's really were a marvelous time it seems Posts like these just remind me of how I had my head up my ass in the 80s expending time on fruitless, hedonistic activities. 20/20 hindsight. On the other hand, suppressors pretty much sucked then, and now is a golden age for both hosts and cans. 
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Posted: 8/22/2021 5:28:00 PM EDT
[#7]
For a modern version of the Quiet Throwaway, would the use of bronze wool 'tubes' between rubber wipes still be the go to?
Or is there a better, modern but still cheap and off the shelf option? |
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Posted: 8/22/2021 6:01:50 PM EDT
[#8]
Quote HistoryQuoted: For a modern version of the Quiet Throwaway, would the use of bronze wool 'tubes' between rubber wipes still be the go to? Or is there a better, modern but still cheap and off the shelf option? One of the reasons the old HE rimfire cans got loud quickly was that the inside of the compressed bronze wool tubes leaded up quickly ...... and there was really no way to remove it. Wasn't a problem when you could just order another dozen or so from SWD ....... I'd think the easiest way to rehash this concept would be a registered mono core....threaded to fit your bbl, and also to accept your "throwaway" tube...... Even then, like with a registered oil filter adaptor, you'd have to send it to an SOT to have the disposable "tube" replaced legally |
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Posted: 8/22/2021 8:15:17 PM EDT
[#9]
I have one of the #10 barrels for a Ruger Mk that I bought back in the early 90’s but never installed. It’s still in the package with instructions and some sort of clip.It has a very course thread pitch which I have no idea the pitch. Business used to sell some sketchy stuff back then.
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Posted: 8/22/2021 10:19:26 PM EDT
[#10]
Quote HistoryQuoted: I have one of the #10 barrels for a River Mk that I bought back in the early 90’s but never installed. It’s still in the package with instructions and some sort of clip.It has a very course thread pitch which I have no idea the pitch. Business used to sell some sketchy stuff back then. If it's threaded for a coke bottle, it's just what i need to build these silencers. Give me some fun can ideas, i wanna build them!  oil filter silencer first test fire. |
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Posted: 8/23/2021 10:38:18 AM EDT
[#11]
Quote HistoryQuoted: I have one of the #10 barrels for a River Mk that I bought back in the early 90’s but never installed. It’s still in the package with instructions and some sort of clip.It has a very course thread pitch which I have no idea the pitch. Business used to sell some sketchy stuff back then. Thread pitch on them is 7/16 x 14tpi |
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Posted: 8/23/2021 9:06:05 PM EDT
[#12]
Ok, that’s pretty nifty. Not practical at all in our NFA/tax stamp world, but cool.
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Posted: 8/24/2021 11:58:46 AM EDT
[#13]
Thanks so much for posting this. This is the kind of thing I send to a photo lab for printing and framing in my office. Super neat.
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Posted: 8/24/2021 12:06:17 PM EDT
[#14]
Damn, some good memories there!
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Posted: 8/24/2021 12:19:43 PM EDT
[#15]
Quote HistoryQuoted: Ok, that’s pretty nifty. Not practical at all in our NFA/tax stamp world, but cool. if us normies (non-SOT guys) could build and test shit without a stamp and a wait we would have an explosion in can tech. My buddy may have done a liter bottle on a 22. First round was loud because it was going through the plastic, but a few more and you had a good hole. Had it been packed with anything it would have been damn near silent, and all of free to build. |
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Posted: 8/24/2021 3:15:05 PM EDT
[#16]
Quote HistoryQuoted: One of the reasons the old HE rimfire cans got loud quickly was that the inside of the compressed bronze wool tubes leaded up quickly ...... and there was really no way to remove it. Wasn't a problem when you could just order another dozen or so from SWD ....... I'd think the easiest way to rehash this concept would be a registered mono core....threaded to fit your bbl, and also to accept your "throwaway" tube...... Even then, like with a registered oil filter adaptor, you'd have to send it to an SOT to have the disposable "tube" replaced legally Quote HistoryQuoted: Quoted: For a modern version of the Quiet Throwaway, would the use of bronze wool 'tubes' between rubber wipes still be the go to? Or is there a better, modern but still cheap and off the shelf option? One of the reasons the old HE rimfire cans got loud quickly was that the inside of the compressed bronze wool tubes leaded up quickly ...... and there was really no way to remove it. Wasn't a problem when you could just order another dozen or so from SWD ....... I'd think the easiest way to rehash this concept would be a registered mono core....threaded to fit your bbl, and also to accept your "throwaway" tube...... Even then, like with a registered oil filter adaptor, you'd have to send it to an SOT to have the disposable "tube" replaced legally A monocore would no doubt be the 'best' option, but would also defeat the charmingly shady 'throwaway' requirement. Note the not so subtle mention of how the QT can be disposed of in a fire in the Ad Copy... As a thought experiment, I was thinking of what could be the cheapest, most off the shelf, and disposable materials. I'm curious how a mix of rubber wipes and corrugated cardboard baffles would work?  These would be essentially free, made from amazon or other carboard boxes using a 25mm Arch Punch (or whatever exact ID is of a soda pre form). Same punch that would form the rubber wipes.  Using a 6mm punch, holes could be made in the center of each disc:  Since each 'baffle' has a lot of internal surface area due to being corrugated, it may offer pretty decent gas trapping ability.  The little discs could be made hard and flame resistant by dipping them in a solution of Sodium Silicate 'waterglass' which is used to fireproof rocket tubes and nozzles in pyrotechnics. Although I'm not even sure if that would be necessary for a disposable .22 if it only has to work well for 1x magazine. |
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Posted: 8/24/2021 9:36:47 PM EDT
[#17]
Some sort of cheap, pressed cup might work. Caps from twist off aluminum beer bottles come to mind. Aluminum doesn’t “cone” well, but ductile steel or copper does. There might even be brass grommets close enough. Keep thinking long enough and a K-something might pop into our heads.
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Posted: 8/25/2021 8:44:22 AM EDT
[#18]
I would try a baffle free design made of just screen mesh from the hardware store. They sell huge rolls of it pretty cheap to re screen doors.
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Posted: 8/25/2021 9:34:23 AM EDT
[#19]
The cool kids use shoe eyelets.
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Posted: 8/25/2021 10:23:33 AM EDT
[#20]
A designer once built a .22 can using corrugated cardboard and PVC pipe. He ran it on a Browning .22 rifle and reported it worked very well.
There's a pic of it sectioned on page 91 of Dave Truby's Silencers in the 1980's. SilentMike |
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Posted: 8/25/2021 2:12:55 PM EDT
[#21]
Quote HistoryQuoted: A designer once built a .22 can using corrugated cardboard and PVC pipe. He ran it on a Browning .22 rifle and reported it worked very well. There's a pic of it sectioned on page 91 of Dave Truby's Silencers in the 1980's. SilentMike Great tip, I found the book on PDF: https://www.pdfdrive.com/modern-firearm-silencers-j-david-truby-e83706393.html 
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Posted: 8/25/2021 2:41:18 PM EDT
[#22]
Bingo!
I was fortunate enough to find a brand new copy of that book a few years back to replace my original (from the 80's) that was well loved and falling apart. That book, Silencers, Snipers and Assassins, and both of Truby's Quiet Killers have a lot of interesting info from the 80's on back. SilentMike |
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Posted: 8/25/2021 3:55:46 PM EDT
[#23]
Quote HistoryQuoted: Bingo! I was fortunate enough to find a brand new copy of that book a few years back to replace my original (from the 80's) that was well loved and falling apart. That book, Silencers, Snipers and Assassins, and both of Truby's Quiet Killers have a lot of interesting info from the 80's on back. SilentMike Ah, the 80's - when there was no pretense of "hearing protection" in the marketing Check out PDF drive, they have a ton of the Paladin and similar works on there, all for free. Plus countless novels and other more mainstream books. |
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Posted: 8/28/2021 11:30:34 AM EDT
[#24]
I would think the best way to make QT suppressors today would be to 3D print them. You can experiment with any kind of geometry/baffles, print them off and tap the threads. It doesn’t get much simpler than that if you have the know how and printer.
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Posted: 8/28/2021 2:21:38 PM EDT
[#25]
Quote HistoryQuoted: Ah, the 80's - when there was no pretense of "hearing protection" in the marketing Check out PDF drive, they have a ton of the Paladin and similar works on there, all for free. Plus countless novels and other more mainstream books. there are some great PDF's on there |
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Posted: 8/28/2021 8:46:12 PM EDT
[#26]
Quote HistoryQuoted: there are some great PDF's on there If you see some cool ones on there, let us know which ones to download. |
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Posted: 8/29/2021 1:13:21 PM EDT
[#27]
Quote HistoryQuoted: If you see some cool ones on there, let us know which ones to download. Quote HistoryQuoted: Quoted: there are some great PDF's on there If you see some cool ones on there, let us know which ones to download. look under Munitions also conversion |
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Posted: 8/29/2021 5:59:50 PM EDT
[#28]
Quote HistoryQuoted: For a modern version of the Quiet Throwaway, would the use of bronze wool 'tubes' between rubber wipes still be the go to? Or is there a better, modern but still cheap and off the shelf option? Oil-Can Suppressor. The Adapter is Registered as THE Suppressor. The Oil Can itself is thrown away after you're down with it. Can't get much cheaper than that.   Failed To Load Title |
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Posted: 8/31/2021 12:33:14 PM EDT
[#29]
Quote HistoryQuoted: Throwaway? Oil-Can Suppressor. The Adapter is Registered as THE Suppressor. The Oil Can itself is thrown away after you're down with it. Can't get much cheaper than that.  https://www.youtube.com/watch?v=EExnpnXW7WcYup, my thoughts exactly. Might see if I can find a place to machine either aluminum or steel cap that matches a 2 liter cap. Obviously the top would have to be thicker to thread for the barrel. Then just engrave and serialize it, and form 1 it. Boom, then can try out stuffing all sorts of stuff into one of those tubes. Anyone with the available equipment wanna do a run of caps??? |
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Posted: 8/31/2021 1:09:06 PM EDT
[#30]
Quote HistoryQuoted: Check out PDF drive, they have a ton of the Paladin and similar works on there, all for free. Plus countless novels and other more mainstream books. 
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Posted: 8/31/2021 2:27:19 PM EDT
[#31]
Quote HistoryQuoted: Yup, my thoughts exactly. Might see if I can find a place to machine either aluminum or steel cap that matches a 2 liter cap. Obviously the top would have to be thicker to thread for the barrel. Then just engrave and serialize it, and form 1 it. Boom, then can try out stuffing all sorts of stuff into one of those tubes. Anyone with the available equipment wanna do a run of caps??? Quote HistoryQuoted: Quoted: Throwaway? Oil-Can Suppressor. The Adapter is Registered as THE Suppressor. The Oil Can itself is thrown away after you're down with it. Can't get much cheaper than that. https://www.youtube.com/watch?v=EExnpnXW7WcYup, my thoughts exactly. Might see if I can find a place to machine either aluminum or steel cap that matches a 2 liter cap. Obviously the top would have to be thicker to thread for the barrel. Then just engrave and serialize it, and form 1 it. Boom, then can try out stuffing all sorts of stuff into one of those tubes. Anyone with the available equipment wanna do a run of caps??? Ya'll two might want to check out how ATF defines "silencer" and how you go about replacing that oil can.
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Posted: 8/31/2021 4:37:18 PM EDT
[#32]
Quote HistoryQuoted: Throwaway? Oil-Can Suppressor. The oil filter is absolutely a classic. However, what I think is so cool about the Cobray QT is that its a throwaway / super easy DIY suppressor, but actually is the correct size and form factor of a proper .22 suppressor (~1"x5"). It could be used with sights / a RDS, and would only weigh 3-8oz.  Whereas the oil filters are ridiculously oversized:  |
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Posted: 8/31/2021 4:41:53 PM EDT
[#33]
Quote HistoryQuoted: Thanks Quote HistoryQuoted: Quoted: Check out PDF drive, they have a ton of the Paladin and similar works on there, all for free. Plus countless novels and other more mainstream books. Happy to share. PDF Drive is one of the greatest places on the internet if you love to read. There's really an Amazon level selection of books on there - from Paladin Press to Pulitzer Prize. Novels, cook books, books on science and engineering, psychology, biographies, history, out of print stuff, its tremendous. |
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Posted: 9/1/2021 5:06:35 PM EDT
[#34]
Quote HistoryQuoted: Yup, my thoughts exactly. Might see if I can find a place to machine either aluminum or steel cap that matches a 2 liter cap. Obviously the top would have to be thicker to thread for the barrel. Then just engrave and serialize it, and form 1 it. Boom, then can try out stuffing all sorts of stuff into one of those tubes. Anyone with the available equipment wanna do a run of caps??? Sooo, anyone here able to make the cap (I’ll pay of course)? If not, gonna have to find a local machinist. Any recommendations for someone good to do it, before I try and find someone local? |
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Posted: 9/1/2021 5:31:42 PM EDT
[#35]
Quote HistoryQuoted: Sooo, anyone here able to make the cap (I’ll pay of course)? If not, gonna have to find a local machinist. Any recommendations for someone good to do it, before I try and find someone local? Quote HistoryQuoted: Quoted: Yup, my thoughts exactly. Might see if I can find a place to machine either aluminum or steel cap that matches a 2 liter cap. Obviously the top would have to be thicker to thread for the barrel. Then just engrave and serialize it, and form 1 it. Boom, then can try out stuffing all sorts of stuff into one of those tubes. Anyone with the available equipment wanna do a run of caps??? Sooo, anyone here able to make the cap (I’ll pay of course)? If not, gonna have to find a local machinist. Any recommendations for someone good to do it, before I try and find someone local? The soda bottle adapter seems to already exist: https://www.infiniteproductsolutions.com/adapters/1-2-28-rh-to-bottle-thread-adapter-with-grip-knurled/ I think its just a matter of getting the tax stamp (or SOT exemption) and then combining it with the soda preform tubes to recreate the 80's Cobray QT. Googling / Ebaying etc "Soda bottle thread adapter" turns up a number of results. 
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Posted: 9/1/2021 6:04:33 PM EDT
[#36]
Quote HistoryQuoted: Sooo, anyone here able to make the cap (I’ll pay of course)? If not, gonna have to find a local machinist. Any recommendations for someone good to do it, before I try and find someone local? Thread specs should be available here: https://www.isbt.com/threadspecs-downloads.asp |
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