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Alstone · Moderator & Site Supporter

After upping the power on my Twinmaster to 500ft/sec I found that the silencer was not working as it should, and it has a crack louder than a .22 rim fire without it, so I decided to make a new one and a muzzle brake for when I an not using the silencer. The new one worked out better than I expected and cuts the sound down so that at 10m all you can hear is a dull “phutt”, Just like the movies.

AL

Looking down in the Silencer

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AirGunEric · Site Admin

So what did you put inside it, design-wise? Multiple chambers, some sort of sound deadener in a/the expansion chamber, any sort of baffles?

Alstone · Moderator & Site Supporter

Hi Eric
I use a setup silencer with adjustable Baffles and sliding outer tubes
to get the optimum setting for number of baffles, length of tube ect, and when I am happy with the result I make one using the data from the test setup.
AL

AirGunEric · Site Admin

Interesting- but good idea. I've never seen a test silencer in person- totally illegal around here.

You made the muzzle brake as well? Looks to be about 2" long and suits that twinmaster well.

AirGunEric · Site Admin

Al sent me this (he was concerned about the possible legality of it, depending on where this forum is hosted- but this is not an issue, so...):

One of my main interests is silencers and this has gone on for many years, but now it is limited to just air guns, Co2 in particular.

You said you had not seen a setup silencer well they are pretty rare the one I have I acquired when I was an apprentice in a armaments factory in the 1950s, I did used it quite a lot for .22 rim fire but now I only use it for air guns, it has been repaired a few times over the years but it still works OK.

You can change the threading to and fit any gun you like, all the baffles are adjustable, sound deadening can be improved by the use of steel wool held in place by fine brass mesh, the O-ring baffle with the spring can be fitted in to the body of the silencer, and when fired the baffle will travel down the tube stopping gas from passing the pellet until the pressure as dropped, the length of travel can be measured and the volume of the tube calculated, when I have finished testing to find the volume required I remove the end cap seal the muzzle end and fill with water to the baffle then when I make the proper silencer I fill it up with the same volume of water and mark the baffle position, I does not matter what size of tube you use the volume stays the same.

A bit crude I know but it works.

Thank-you for the info, Al- always useful.