Use a shitty worn out motor. Adjust the pinion gear height so that it can barely contact bevel gear, just enough to cycle the AEG. Don't grease your gearbox. Don't use a spring guide with bearings. Make sure that anything that can be replaced with metal is metal.

Noveske Flash Hider
 

I got one of these off ebay, but there were no cones inside, and no way to adjust it at all. Is there another version of this that looks exactly the same but is not a sound amplifier?

Yup, there is the $50-60 madbull one and then the cheap china knock off that doesn't actually do anything

Ta-da!

http://www.airsoftparts.ca/store2/in...roducts_id=571

This or get better earphones

Full cylinder & short barrel will give you a louder pop too if you want to go internal...

Guess I got the cheap knockoff then, thing is it is identical, every marking is the same. How can you tell which one is the real deal?

Position of the inner barrel makes a huge difference with the fire pig. If it stops too far forwards it won't resonate.

My inner barrel comes out abotu 1/4 inch from the threads...

For the fire pig to work well the inner has to end just inside the base (narrow part) of the fire pig then the air is forced in behind the cone till its full then pops out back into the cone and exits with a nice POP sound. If you adjust the cone forward so the opening is bigger itll catch more air snd the pop wilo become lower sounding.

As far as making you saw quieter get some mouse pad or dynamat (from car audio places) and fill it in any open spaces around the gearbox and in the body of the aeg to muffle the echo in the body. Then ad a thick sorbo pad bearing bushings bearing spring guide pom piston head with bearing helical gears and a perfect shim job (kind of escential with helical gears anyhow) and you wont really need a silencer the pom and sorbo will takebcare of most of the POP sound the gears and besrings will elimijate most of the whine from the gearbox and the dynamat will muffle the rest you should mostly only hear the motor and the sound of the box mag will almost be as loud as that. Ive always wanted to build a "silenced" aeg just never got around to it yet but thems be the steps to take. Wont be perfectly silenced but will be damn quiet. Also going to a softer spring (320-340fps) will help too but we all know we want that majic 400 fps so i omited that.

The real sound amp for airsoft is made by mad bull and will most likely state on the website that it is a sound amp or gives some indication that it is one.

http://www.airsoftparts.ca/store2/in...roducts_id=571

For example the one listed on this website states that it has "inner adjustable cups".