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Full Length Barrel Shrouds

Discussion in 'Technical' started by Figgy, Feb 19, 2021.

  1. Figgy

    Figgy Very Active

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    Screenshot_20210219-173912__01.jpg Decided to make a full length carbon fiber shroud.
    Made a few different length silencers for the impact compact but want something short and effective.
    Bought a length of 28 x 1mm carbon tube and set about making a decent air stripper, and a way of clamping the shroud to the barrel that keeps it in place. Needing to remove the carbon tube, as I'm putting baffles along the barrel to reflex the shroud and need to get to them.
    The shroud is 250 long this allows 75 mm in front of the air stripper for normal silencer baffles.
    This isn't finished yet so I will update as I go. I know some like this sort of thing.
    Some pictures showing what I've done to date, air stripper marked up for milling out, the black line is end of barrel nut. The end cap is threaded and the ferule is threaded and knurled for glue to get a mechanical grip of. This is so I can play with end cap outlet hole sizes if I feel the need to do so. The rear cap is also made of delrin threaded and chamfered with a slotted male end, so when the two parts are screwed together to grip the barrel, the carbon shroud will be fixed with one or two grub screws to the delrin clamp cap end as it needs to slide over the stripper. I have thought of making a brass stripper and bonding it in the carbon tube to then allow just a plain cap end at the rear.
    So any thoughts on best baffles and reflex baffle design ? I was going with the usual pvc tube milled out slots and accoustic four way stretch carpet or felt all in varying sizes.
    How much baffling in the reflex part? Thoughts on vents at the rear yes or no ?
    Screenshot_20210219-171051.jpg Screenshot_20210219-171058.jpg
     
    Last edited: Feb 23, 2021
    mutley and Phil Spectre like this.
  2. Figgy

    Figgy Very Active

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    An update made three single section baffles for the front 3" and made holed baffle washers for the reflex part of the shroud.
    I'm going to drill two small vent holes at the rear pointing out around 30 degrees down, I think 1.5 or 2mm holes will do to release and pressure slowly from the baffles.
    The front silencer part is made of 21mm pvc pipe in two sections of lengths 35mm 23mm and finally a 25 mm long 15mm pipe with large holes milled into it as this needs to sits inside the front cap.
    With the baffle washers it works out a little over the original 75mm but I wasn't going to remake a tiny baffle until I've tried it out.
    Screenshot_20210220-141253.jpg Screenshot_20210220-141338.jpg
     
    Last edited: Feb 23, 2021
    Balders, mutley and DSTM like this.
  3. DSTM

    DSTM Engaging Member

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    That looks very well thought out
    Can I ask what the fully enclosed section to the left hand side is for?
     
    Figgy likes this.
  4. Figgy

    Figgy Very Active

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    That is the reflex part of the silenced shroud over the barrel.
    If you look at the pictures you'll see that I've drilled holes all around the baffle washers to let the air pass into the next chamber and then vent out the two 3mm holes I drilled in the carbon shroud. I looked at the 1 5 & 2 mm decided they were too small.

    I will end up playing with the design as I make another. @bucketboy made a locking ring out of Delrin like a ER collet so might try that at some point.
    The next one I'm planing to bond the brass air stripper to carbon so it won't need a compression nut.

    I tried dry firing it today and it's very quiet, Need to test with pellets next and check for clipping, I made the air stripper hole tight at 6 mm.
     
    Last edited: Feb 23, 2021
    DSTM likes this.
  5. Figgy

    Figgy Very Active

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    Update on how the silenced shroud worked out.

    Managed to get out in the garden after all the rain and winds to do a little testing.
    Initial testing showed pellets going way off to the right, :facepalm: I thought ohh no something is very wrong. So I tried turning the shroud 90 degrees brought back the poi to an inch of my zero. I thought keep going and testing, managed to have it shooting half inch higher than my zero. Turned it 180 degrees it got better but not perfect, so turned it a little more and bang on my zero.
    I can can only think that some fibers of the accoustic material I used got stuck between the shroud and baffle washers. Turning the shroud sorted it out.
    It's as quiet if not quieter than my 198 mm silencer I made.
    I took some recordings on my phone placed it 1 meter in front and 1 meter to the side and the pellets hitting the cardboard target and slate paver backstop is much louder even though it was 24meters in front of my phone :D.
    I'm pleased with the results so far and will check that their is no poi shift after leaving it for a while.
    Love the way it looks on my Impact Compact, not sure about how shiny it is though so may spray it with a matt sheen clear coat to tone it down. When ordered I could have sworn I picked the matt finish tube :shrug:
     
    xenophon likes this.

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