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Old 05-11-2020, 11:15 AM   #1
Stince   Stince is offline
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suppressor foam hole size

what size should the holes of the foam of my suppression system be to not interfere with the bb but still catch enough excess air to be effective
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Old 05-11-2020, 02:52 PM   #2
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8mm is a good starting point. Then just test and see if it needs to be wider.
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Old 05-11-2020, 04:26 PM   #3
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I have posted this a couple of times on the forums. So I am just cutting and pasting.
"I make my own foam to go inside a silencer. I use foam from an old crappy mattress (very soft and bouncy). Just push the silencer onto the foam and twist sideways until the foam it cut into the silencer. I then use a 8mm hole punch to cut a hole in the middle of it.
When putting the foam back into the silencer, you will notice that the foam compacts a little and this makes the central hole a little smaller. So the hole is only about 7mm in diameter. Just enough for the bb to get through. This works a treat. "
I also put the foam in place in the silencer before making the hole in the centre and then fire a shot. This means that I am marking where to make the hole because bb's do not fly exactly straight and sometimes the inner barrel may not match the exact centre of the silencer. So fire a shot and the use a hole punch to make the hole.
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Last edited by 1tonne; 05-11-2020 at 04:31 PM.
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Old 05-12-2020, 01:35 PM   #4
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Cut multiple rings of foam with inner hole diameter about 9mm. Silencer works when inside there are air chambers which means it can’t just be a solid foam pipe. I usually put few rings iside 1” thick and leave 1” space between them.
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Old 05-12-2020, 04:06 PM   #5
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Quote:
Originally Posted by Jsmithski View Post
Cut multiple rings of foam with inner hole diameter about 9mm. Silencer works when inside there are air chambers which means it canít just be a solid foam pipe. I usually put few rings iside 1Ē thick and leave 1Ē space between them.

That is also what I believed too. Spacing out the foam inserts. But this depends on the material used. I tried spacing out the foam inserts vs putting them all the way through the silencer and the quieter way was to put it all the way through when using soft foam. I think it depends on the material used. If the material is harder and less porous, then it is better to space them out but if the material is soft and porous then you can put it all the way through the silencer.
The reason for spacing the inserts out is to create areas where the gas can expand and then get captured in this area. But if the foam is porous enough, then the foam will already soak up those expanding gasses pretty well.
So experiment.
Also remember that when testing, you want to check the noise that is coming from the muzzle and not from where you are shooting from. Your position while holding the rifle will be louder than at the end of the muzzle if the silencer is working correctly.
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Old 05-12-2020, 06:28 PM   #6
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It all depends on what you’re suppressing. A spring rifle (with that piston SLAP), an hpa engine and a co2 setup will all work differently when shot through a Banana. Hpa is the easiest to quiet down since they usually are already dummy quiet. But my mk2 co2 pistol for example. I tried a suppressor filled with different foam, spacing, cuts etc and it didn’t change much until I added the fart flap. Best bet is to just experiment a little or find out specific foam and dampening materials others have used with setups similar to yours!
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Old 05-15-2020, 09:03 AM   #7
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Good points guys. Indeed pores make the difference.
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Old 05-15-2020, 04:05 PM   #8
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Quote:
Originally Posted by Blind Sniper View Post
It all depends on what youíre suppressing. A spring rifle (with that piston SLAP), an hpa engine and a co2 setup will all work differently when shot through a Banana. Hpa is the easiest to quiet down since they usually are already dummy quiet. But my mk2 co2 pistol for example. I tried a suppressor filled with different foam, spacing, cuts etc and it didnít change much until I added the fart flap. Best bet is to just experiment a little or find out specific foam and dampening materials others have used with setups similar to yours!

The Mk1 and mk2 are pretty much the same gun. The main difference is the CO2 vs Green Gas. I have a Mk1 and it is very, very quiet (Beats every Mk23 that I have ever heard and I have heard some very quiet ones. We have a Mk23 fan club at our field). Try fiddling with the spring to adjust the amount of gas that goes through the barrel. The mk1 was always way too much gas and so even with a silencer it was really noisy. But once I adjusted the spring in the rear to be weaker, there was way less noise and gas (Better gas consumption too). It also brought the fps down to about 330fps instead of 420fps.
I believe it doesn't matter too much about what you are suppressing though Gas guns do have the advantage that you do not have a piston slamming. It is more about getting the correct amount of gas to push the bb out of the barrel at the desired speed without expelling the excess gas.
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Old 05-16-2020, 03:09 AM   #9
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Yea very small differences between 1 and 2. The mock charging handle is plastic on a 1 and metal on a 2. The trigger guards are shaped differently and the 2 has the fluted barrel. I have a mk1 carbine I modified for co2 mags. Aka chopped the lower body up so it clears the cartridge. THATS really the main difference is the rounded/wider body in the mk2 to fit a co2 cartridge. I cut a section out of a mk1 carbine lower and when you slide the carbine stock (part of the grip plates) it clears the co2 cartridge! I can’t wait to finish it!! Also hacked ye old barrel and fit a Novritsch suppressor!
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Old 05-16-2020, 10:02 AM   #10
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What a cool pistol, I would love to test it.
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