Author Topic: Silencing  (Read 1301 times)

Offline AirZoft

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Silencing
« on: June 07, 2009, 11:36:08 PM »
Wasn't sure if this was the correct place to post on making an AEG more quiet, but accessories seemed to fit the best.

For some time I've been looking into silencing my MP5A5 (MK5A5). Now of course mock silencers don't actually hinder the noise, and are commonly just used to hide an extended barrel. Gas guns may be affected slightly with a modified mock silencer with acoustical (sound-dampening) material lining the inside to distribute the escaping gasses. There are also pistol grips that are built specifically to silence the motor, but I have only come across ones built to work on M4/M16 series weapons. Since most of the noise on AEG's comes from the gear-box and motor, the material must be applied to the lower receiver and pistol grip. I have tried to line the insides of both with thin pieces of cloth (Cotton) and insulating foam. The sound was reduced some bit from the motor turning the gears and the overall vibration and noise from inside the gearbox. It hasn't truly gained the low decibels that a suppressor on a real weapon would produce, but noticeablly became more quiet. So far the insulator material has worked better out of the two. I was wondering if anyone has a better idea on materials or an expert understanding on sound-dampening. Will post pics of the receiver and grip if I find a true solution.

^ I also have the systema silent head set.

Gun Info for any Need

ICS MK5SD6 (A5 Stock)
9.6v 1400 MAH
Systema bore up cylinder, cylinder head, silent piston head and nozzle
Systema steel standard ratio gear set
Systema aluminum piston
Madbull 6.03 229mm Tightbore barrel
Systema metal spring guide
Madbull M120 spring (~400 fps)
ICS Stock Turbo Motor
« Last Edit: June 08, 2009, 06:28:59 PM by AirZoft »

Offline SkeptikZ

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Re: Silencing
« Reply #1 on: June 08, 2009, 02:20:05 AM »
To be honest you've probably taken the most and only steps that i've ever heard of for trying to silence a gearbox.  The piston replacement and having a foam filled silencer (either cotton or Styrofoam) are the only ways that i know of to effectively silence an AEG.  The noises created by the gearbox are specifically the sound of the piston (which you've replaced) and the sound of the motor effectively pushing the gears.  And I don't know of anyway to silence the action of the motor.. sorry wasn't much help

Edit: You could try changing the gear set and the motor.  I've noticed TM gearboxes are exceptionally quiet so good luck!
« Last Edit: December 31, 1969, 05:00:00 PM by Guest »

Offline yammie r6s

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Re: Silencing
« Reply #2 on: June 08, 2009, 11:41:10 AM »
i've noticed some full stock aeg's produce an echo. maybe take some of that material you are using and put it in there (if you have a full stock)
a really well shimmed gearbox is a lot quieter than stock
if they made low noise motors that would be the best solution imo
« Last Edit: December 31, 1969, 05:00:00 PM by Guest »

Offline G1zm0

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Re: Silencing
« Reply #3 on: June 08, 2009, 02:51:31 PM »
Quote from: "SkeptikZ"
Edit: You could try changing the gear set and the motor.  I've noticed TM gearboxes are exceptionally quiet so good luck!

My TM MP7, real quiet. But if you can find one a foam filled silencer works pretty well. but i've been told they are illegal.
« Last Edit: December 31, 1969, 05:00:00 PM by Guest »

Offline Vince

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Re: Silencing
« Reply #4 on: June 08, 2009, 03:02:03 PM »
A circle of sorbothane or mouse pad on the piston head works also. I dunno if you could do that with the Systema silent piston head though.
« Last Edit: December 31, 1969, 05:00:00 PM by Guest »


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Offline AirZoft

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Re: Silencing
« Reply #5 on: June 08, 2009, 06:22:50 PM »
To skeptikz: thanks for pin-pointing where the noise actually comes from, I'll double up the foam around these areas if theres any room. I've tried multiple sets of gears including stock, my current systemas, some high-torques and high-speeds and the systemas tend to be the most quiet, maybe I'm not looking at the right companies. I'll throw in the cash to experiment more with the gears and grab a TM gearbox. Thanks!

To yammie: the MP5SD6(A5) is the retractable stock variant, I will test your ideas on my full stock M16 and SCAR although. I've shimmed the gearbox myself and I believe I'm doing it right, further experimentation to be had. Not any 'silent' motors that I'm aware of, will look into it, maybe a custom motor?

To gizmo: I've filled the built-in silencer with both foam and cotton, and it did reduce the minimal noise that the barrel actually produces, thanks for the ideas.

To vince: For one, I like the action boy picture. I'll look into sorbothane and chop up a few old mousepads and test 'em to check compatibility with this head set/grip/receiver.

^ Thanks for all the ideas. I'll post my results within the week depending when I get my parts in on an edit to the first post.
« Last Edit: December 31, 1969, 05:00:00 PM by Guest »

Offline jago

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Re: Silencing
« Reply #6 on: April 25, 2010, 05:07:52 PM »
First off, I know this is an old post. I figured i would just continue with a question on this post to avoid any repeated suggestions. Has anybody tried using rubberized undercarriage paint? I was considering trying to paint the inside of the receivers and grip with it. Anybody tried something similar?
« Last Edit: December 31, 1969, 05:00:00 PM by Guest »

Offline TheBoy988

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Re: Silencing
« Reply #7 on: April 25, 2010, 05:50:11 PM »
If you've got the room inside your receivers try using dynamat. I know of a lot of P90 owners silencing their guns with this stuff because of the room available inside the gun. Dynamat was originally designed for car audio applications but sound is all the same. In my experience the winding of your gearbox and motor are rather difficult to track at any range so i guess you'll have to ask your self is it really worth putting the time and money (Dynamat is not cheap) into making your gun slightly quieter.
« Last Edit: December 31, 1969, 05:00:00 PM by Guest »
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Offline axisofoil

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Re: Silencing
« Reply #8 on: April 25, 2010, 06:00:46 PM »
Quote from: "TheBoy988"
If you've got the room inside your receivers try using dynamat. I know of a lot of P90 owners silencing their guns with this stuff because of the room available inside the gun. Dynamat was originally designed for car audio applications but sound is all the same. In my experience the winding of your gearbox and motor are rather difficult to track at any range so i guess you'll have to ask your self is it really worth putting the time and money (Dynamat is not cheap) into making your gun slightly quieter.

and of course, dynamat, if significantly compressed, will not hinder sound transmission at all.

vibration dampening material at every joint between receivers, and vibration absorbing washers wherever screws are present, especially ones that contact the gearbox. otherwise the sound from the gearbox will just be transmitted over them into the rest of the gun and be emitted from there instead.

sorbothane on a normal piston head/cylinder head combo works amazing. the 'slap slap slap' of the piston is reduced to a muffled thump. Use a lower voltage battery and a better quality motor. Both will reduce the sound quite significantly.

Bottom line is: If you want a truly quiet gun, get a gas bolt action sniper and a foam filled mock silencer.
« Last Edit: December 31, 1969, 05:00:00 PM by Guest »

Offline Shadow

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Re: Silencing
« Reply #9 on: April 26, 2010, 08:48:24 AM »
« Last Edit: December 31, 1969, 05:00:00 PM by Guest »
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