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Another go at my AA silencer internals..

Discussion in 'Anything Airgun Related' started by David M, Feb 3, 2014.

  1. David M

    David M Donator

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    Hi All,

    A little while ago I dismantled my s400's Air Arms silencer and found a noticeable improvement by discarding the supplied muffling material and repacking the two chambers tightly with packing foam around the springs and blue latticed plastic. The original scourer type material was a very poor fit, not being long enough and leaving gaps. I used that modified version from about last Summer to good effect, once taking two rabbits that ran out together at only 22 yards.

    I had another go over the weekend, replacing all the innards with three 10mm diameter hair curlers cut down to equal lengths to fit and made two 26mm diameter waxed card washers as spacers with 6mm holes punched through the middle (gun's a .177). The curlers were packed in the silencer tightly with packing foam, making sure the curlers sat centrally in the tube, the result this time is very good, not much muzzle noise at all with the gun's action 'ting' noticably above it.

    I was a little surprised to find the zero at 33 yards had altered right by an inch yesterday, there wasn't any clipping going on in either variation of internals so the different mashing and restriction of air flow must be making a slight difference to the pellet's journey through the silencer. A few clicks on the horizontal turret had things all lined up again and 5 shot groups (even in a medium wind) were well respectable.

    Cheers.......David......:up:
     
    Last edited: Feb 3, 2014
  2. mattw975

    mattw975 Big Poster

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    Hi David,

    if you want any Delrin washers machined at some stage just let me know :)

    Matt W :)
     
  3. Honest Bob

    Honest Bob Big Poster

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    Did the same thing with a sound biter mod, took out those silly springs, and replaced them with hair curlers & foam, the wife complained. A far better use for the curlers anyway. Bob.
     
  4. Stevie Darling

    Stevie Darling Sexual tyrannosaurus

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    I split my mates aa mod into 4 chambers, 10mm curlers, copper pipe lagging and card for washers.

    A vast improvement:)
     
  5. metalman

    metalman Big Poster

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    Med curlers from Superdrug are pretty good
     
  6. David M

    David M Donator

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    I had a look around all the cheap shops for curlers but couldn't find any so ended up with a pack of 8 from Boots for about £3 I think and just the right size.

    A very good idea using pipe lagging Stevie76, I use it on my shooting sticks and didn't notice.!!

    I'd just like to point out that I have one of Matt's superb delrin silencers on my springer and can't fault it. I'd recommend them as first choice every time to get the best from a silencer.. I take PayPal Matt......:D
     
  7. Stevie Darling

    Stevie Darling Sexual tyrannosaurus

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    I'm obsessed with silencers! Always messing around with internals. The 2 best materials I've found so far is, pipe lagging, and thick felt insoles I found in an old pair of boots.

    Tried the green scourer stuff, but found the other 2 to be a lot better at muffling that muzzle snap:)
     
  8. mark.177

    mark.177 Donator

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    re packed the aa one on my s400 .177 trying to get it quieter. experimented with a few different materials. it ended up quieter than my mates shrouded .22 hw100 with a weihrauch mod!
    as it was .177 i reduced the internal dimensions of the baffle spacers and exit port. ended up with some very squidgy foam from the armour pocket in a motorcycle jacket. i also drilled 4 small rearward facing holes around the circumference of the rear of the last section to vent and divert the lower velocity air rearward reducing the air/noise vented forward out the front. actually drilled the same holes in the front section but the pressure is higher and i was worried the venting gas would affect accuracy so blocked the rear ones up. it was very very quiet!
    the last two pics show what was inside and the foam i used to replace the undersize bits of brillo pad stuff
    the pic showing the front section was reduced using plastic tube epoxied into the end, you can also see the centre spacer with the same epoxied in place.
     

    Attached Files:

    Last edited: Feb 3, 2014
  9. David M

    David M Donator

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    Nice one Mark. That's the exact same foam I use, I got mine from a packing box a few years back and knew it would come in handy one day. If I've got it right and you're still using only two halves to the internals with a centre spacer, try the same packing around 3 cut down curlers and 2 separating washers with 6mm holes through them like my original post. The difference is amazing again...!!
     

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