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How to silent the Amoeba M4 AM-009?

1982 Views 15 Replies 5 Participants Last post by  mrFonzie
Hi everybody, I have a Amoeba M4 AM-009 and my goal is to build a DMR as backup replica.

What I want as DMR is something that is equally long to my Striker AS-02, quite, precise and shot long (65-70 meters): I'm italian so the limit here are 1J. I'm not interested in high roof and programmable shoots from the moment that I want to shoot only with sinlge shoots.

Talking with other snipers they suggest me to sell my Amoeba and buy a G&G for two reasons:
  1. G&G m4 are alredy very quite
  2. Custom amoeba rifle is complex and very expensive
I saw some M4 from G&G but before to make the decision I want to hear from you (because you are the best) some ideas and suggestions for make my Amoeba quitest (if it's possible and convenient in terms of moneys).

Thanks in advice :)
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An AUG would be good, one that takes M4 mags.
I can't remember what exactly you have to do to them, but @1tonne will tell you why they're so good.
An AUG would be good, one that takes M4 mags.
I can't remember what exactly you have to do to them, but @1tonne will tell you why they're so good.
But I asked for myAmoeba M4 ahahah
Well if you're after sound, the AUG is the way to go, but you can probably just run the M4 the way it is, with a better barrel, bucking, chamber, compression, and nub.
If you lap your barrel and use some .32-.36g ammo you should be able to get pretty decent performance.
a better barrel, bucking, chamber, compression, and nub.
Can you suggest me a list of parts to buy please?
Ares amoeba's have proprietary parts so may not be the optimum platform
Ares amoeba's have proprietary parts so may not be the optimum platform
Why not?
As he said, there are proprietary parts. This means, essentially that some of the better, more quiet part may not be compatible with Ares guns.
However, I recall that most of the proprietary parts are around the ETU so this may not be so much of a problem. The only issue I foresee is with precock, however, that is very much possible on a Ares ETU. It's just a bit of a pain to do.

I can't remember what exactly you have to do to them, but @1tonne will tell you why they're so good.
It's because the AUG has lots of plastic surrounding the gearbox to muffle gearbox noise.

Can you suggest me a list of parts to buy please?
Here's a link to a thread @1tonne made on another forum.
A precocking MOSFET will be your best friend
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A precocking MOSFET will be your best friend
Normally, an airsoft gun has to wind the gears all the way when you press the trigger, and cycle the piston all the way back. A MOSFET with precock will keep the piston almost fully compressed, so that when you press the trigger, the gears only have to turn a little bit before the piston is released. It often takes away some of the whining sound of the motor. Shimming the gearbox would also be good. If you have the money, brushless motors are dang near silent. As far as MOSFETs go, I think you might have a little trouble because of the Ares EFCS and might need an entirely new gearbox shell.
I think you might have a little trouble because of the Ares EFCS and might need an entirely new gearbox shell.
No need.
The EFCS can be modded to precock. You just switch the position of the magnet in the gears.
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I'm not understaing well... at the end what should I do to make it quiter? or is better that I sell them and I buy a new replica?
You'll want to fill the silencer with foam and put in a shorter barrel, but if I give you direct details the owners will ban me because of their small dick energy.

Just look of airsoft suppressor on YouTube or copy the Novritsch one, they're easy enough to make.
I'm not understaing well... at the end what should I do to make it quiter? or is better that I sell them and I buy a new replica?
Read the guide here: How to make the quietest AEG ever

In fact, here, I'll copy paste it for you.
Credit to @1tonne
After years of trying to make the quietest AEG ever, I now have the knowledge to make the quietest AEG ever. This rifle will be quieter than the Mk23 Socom pistol which is renowned for stealth.

There are 5 areas of sound that you want to lessen. First the sound signature of the rifle (Length of sound). Next is the squelching sound (Gearbox Noise). You also want to get rid of the spring sound (Twang). Stock vibration also and lastly is the muzzle sound (piston slap noise exiting barrel).
Of these 5 areas, the hardest one to eliminate is the squelching sound from the gearbox. Gearbox's that have a motor cage are the easiest to reduce the squelching sound as the motor should be trapped in the correct position all the time. Gearbox's like in the M4 are a lot harder to reduce sound as the motor can move a little off alignment.

To make the quietest AEG there are 22 points you will need to work on. Here they are

1. Air seal - When you have a good air seal you can use a weaker spring because you do not have as much waisted gas. The areas to check are O-ring seal, Cylinder to cylinder head, air nozzle to cylinder nozzle, air nozzle to hopup bucking and lastly, hopup bucking to barrel. Most of these can be fixed rather simply. The hardest is the seal between the air nozzle and the bucking. To seal between the air nozzle and the bucking properly, check out number 13 further down the list.

2. Spring- Thread on little bits of heat shrink about 10mm long to your spring at each third and shrink them. This will help stop vibration and get rid of some of the twang sound.

3. Barrel Bore size- The tighter the bore, the easier to get higher fps which means you can use a weaker spring. This means less stress in the gearbox.

4. High Speed Ratio Gears- The quicker the sound is the less your ear will be able to register it. So if you use a high speed gear ratio of at least 14:1 or less (I used 13:1) the rifle will be very snappy. Also these types of ratios have less squelching sound. (High torque motors go well with high speed gears)

5. Use a LONEX Spiral Bevel & Pinion Gear Set- These gears have curved teeth that allow for better meshing of the pinion to bevel gears if your motor is slightly at the wrong angle. This is common in V2 gearboxes as the motor is not in a motor cage.

6. Piston Weight- Make your piston as light as possible by drilling holes in it (this is called Swiss Cheezing your piston). This will make it easier for the sector gear to pull it back meaning less squelching.

7. Cylinder head cushion- Use Sorbathane as a dampener on your cylinder head. This will lessen the piston slapping sound.

8. Choose a cylinder that is smooth on the inside- Some cylinders have ridges that are designed to help keep the cylinder lubricated. The issue with these ridges is that they create more noise as the O-ring goes over them.

9. Use extra thick lubricant on gears- Thicker means it stays on- Less friction which means less squelching noise.

10. Use bearings- Bearings make for an easier cycle. The easier the cycle the less squelching noise from your gearbox.

11. Use gears that have in built bearings- Makes for easier cycle

12. Shim correctly- Lessens the gearbox squelch sound

13. Use an air nozzle that is about 1mm longer than normal or sand the front of the tappet plate so that the air nozzle moves further forward than normal.
NOTE: Sometimes this can cause feeding issue. Retro Arms put out adjustable air nozzles that can help.

14. Use the biggest battery possible- Lessens gearbox sound signature. You do need to be careful though as sometimes this can create more high pitch squelching

15. Use the correct cylinder to barrel ratio- This is one of the most important, if not the most important thing to do when making your rifle quiet. If you use the correct ratio, then you are making your rifle the most efficient that it can be which means you do not need such a large spring to get your desired fps. Also, there will be no extra air being pushed out of the barrel that carries the sound of the piston slapping.

Here are the correct Ratios to make your rifle quiet: (Ratios for a 6.03mm)
BB weight--- Ratio
NOTE: If using a 6.01mm, then you can use a barrel up to 25% longer as there is not so much air lost around the bb.

For all the information you need to know about cylinder to barrel ratios, read this thread that I wrote (It is a must read): What Barrel Length goes with what bb weight in an AEG?

16. The longer the inner barrel the quieter- A longer barrel will produce higher fps so you can use a weaker spring (Less gearbox stress). The disadvantage is that it can make the rifle too long. A bullpup can be good in this instance as the inner barrel can run from the back of the rifle where the magazine is to the front.

17. Use a silencer- This captures the excess sound that is travelling behind the bb. Without a silencer your rifle will be a lot louder. This is expected though as the perfect ratio will have just enough air to push the bb out of the inner barrel. Even though the bb is out of the barrel and there is no excess air pushing the sound out of the barrel, there is still has a negative pressure at the rear of the bb. This negative pressure may drag the excess sound behind it. This excess sound can easily be captured by a silencer. So an airsoft silencer can really work if done correctly.

18. Silencer Length- Different silencer lengths can have different effects on the sound that comes out of the end. A silencer can be too short or even too long. So experiment with different silencer lengths or use a shorter outer barrel so that the inner barrel sticks into the silencer more. This will have the same effect as using a short silencer.
I originally used a silencer that was long (243mm long) and it made the rifle louder and so now my quietest AEG has a silencer that is only 173mm long.

19. Silencer Muzzle Hole Diameter- A normal airsoft silencer muzzle hole is about 12mm in diameter. If you put washers that have an 8mm hole between each piece of foam, the muzzle sound should be more trapped inside the silencer in each little compartment. You do need to be careful that the bb does not skim one of the washers as make the gun inaccurate.
But be careful as you will need to experiment. On the odd occasion, modifying a silencer like this can increase the sound.

20. Try different materials in the silencer- Different materials will reduced the sound waves differently. Also try the material compressed into the silencer and then not compressed. Different rifle setups will produce different sound waves. So experimenting is key here.
In my AUG, I used a white fluffy material that is used for sound deadening in buildings. I rolled is up around a spring to keep the fluff away from the bb.

21. Use Dynamat Sound Deadening- Put Dynamat sound deadening in as many places as possible. In an M4, there is not many places to use it as the M4 has very limited space. On an AUG, you can wrap the gearbox in it and put it on the inside walls of the stock.

22. Fill empty spaces- Fill any spaces in the rifle, especially the receiver with sound deadening foam or fluff. In an M4, there is not many places to use it as the M4 has very limited space. On an AUG, you put it between the gearbox and the stock walls.

23. Semi Auto- Use semi auto as it gives a shorter sound signature than full auto

24. Motors can also add a lot to noise. A motor with an unbalanced armature or a slight bend in the shaft will vibrate more. This will make noise between the pinion and bevel gear as it will not have a consistent meshing

Here is what my rifle has:
-Army Armament Styre AUG
-SHS Ultra high Torque motor
-Super Shooter 13:1 gears
-M100 Spring (Producing 350fps) (Heat shrinked)
-Full Cylinder: Ratio = 2.18:1 for 0.25gm bb's
-Barrel: Action Army 510mm x 6.01mm
-Air Nozzle =Stock (24.75mm)
-G&G Green bucking
-Sorbathane on cylinder head
-Piston: G&G Polycarbonate with a single metal tooth (Swiss cheesed)
-Piston head: G&G Plastic
-Bearings: Can’t remember the brand
-Silencer: 173mm x 40mm with foam inside (Round washers with 8mm hole inside)
-11.1v Lipo
-Dynamat on gearbox and inner stock

NOTE: To test if the sound is coming from your muzzle, put the receiver between 2 pillows with the muzzle sticking out and fire it with the desired bb weight. If you want to test the gearbox noise, just put a thick rag over the end of the muzzle and then cover the muzzle with the pillows and fire with the desired weight.

NOTE 2: I tested the sound in a similar way to how a lot of other rifles are tested. This is with the decibel meter 1 meter to the left of the barrel, at a height of 1.6m (standing shot) and the microphone pointed straight up at 90 degrees to the direction of travel of the bullet (to eliminate projectile pressure).

So I measured the sound of my quiet rifle and I also measured a couple of other rifles too. A G&G CM16 and also a short barrel Ares Amoeba. This is a short stubby loud gun.

Check out this video:

Quiet AUG = 72.93dB (78.2dB without silencer)
Quiet M4 = 78.53dB
Mk23 Socom = 79.43dB
G&G CM16 = 85.2dB
Short Ares Amoeba = 87dB
.177 air rifle = 88-90dB (Taken off another website)
Mmmh but a list of things to buy in order when you get a new AEG?
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