Building a super loud AEG

[Catman]

A while ago this started off as just a theory I had, it came about because now and again I'd see people posting about wanting to make their AEGs super quiet and then someone would typically pop into the thread and go "no you want to make it super loud!!"

 

Loud is intimidating and definately more fun than what some would dub "a silenced sewing machine". So the old gears got turning: It seemed pretty clear that the use of a Noveseke "sound hog" muzzle device was the way to go forward so I bought one of these and tried it out on a few of my guns. I found that it make almost no noise impact on my G36 but it worked a lot better on shorter barrelled guns, especially my MP5 PDW. I even tried it on my 1911 I noticed a big difference when it was used on an Escort MP5 but the effect was greatly reduced on a Sun Project M16.

 

The idea I came up with was to create a short barrelled AEG, for it to be as loud as possible, with enhanced "recoil" and shooting around 300fps (our sites recommended SMG fps, though we're allowed up to 350fps).

 

Now on an AEG the clyinder's air volume must be slightly more than that of the barrels. If you put a barrel on that's too long you'll suffer a loss of FPS as there won't be enough air to accelerate the BB all the way down the barrel. For shorter barrels the cylinder must be ported or you'll also suffer loss of FPS beacuse the bb actually leaves the barrel before the full amount of air-compression has been achieved. This principle gave me an idea... I was going to screw with it As the sound hogs work on the volume of air coming out the barrel it seemsed obvious that it'd be all about balancing.

 

My initial idea was to have a strong spring, a ported cylinder and heavy piston with metal piston head. This would create the higher recoil factor I was looking for. However early testing showed this to be pretty much a waste of time, there was barely any noticable difference. I knew the gearbox would be placed under significantly higher stress but I was more keen to see if it was do-able rather than if it was practical. So I scraped the whole recoil idea and went for full on loudness.

 

So rather than blabber on more, here's what I ended up with,

1 Teflon coated unported cylinder

1 Aluminium Piston and metal piston head (couldn't be bothered to remove it)

1 Prometheus 135 spring

1 Barrel of only 135mm

All in a dboys gearbox, steel standard ratio gears and TM EG1000 motor (and a 8.4v battery - those gears really should be higher torque ones!). The setup is giving me roughly 315fps.

 

Here's what she looks like, bare in mind that it's not quite finished I will be intergrating the battery into the stock frame as soon as I get some suitable piping, for now it's just cruedly taped on. Hopefully I'll be able to squeeze a 10.8v battery in there.

 

 

this is the ACM M4 CQB conversion kit, the silencer replaced with the Sound Hog (also ACM)

 

 

 

Under the hood:

 

 

It's definately a success! Inside my workshop firing it actually makes your ears hurt, it's pretty nasty inside an enclosed space - worse when you're infront of it. I tried it out in the last Skirmish and it was brilliant it certainly made some heads duck, the accuracy and range were barely affected and it's proved itself to be a very viable little gun

 

I tried to do a video of it but the damn mic on the camera is useless (as my M2 videos show ) I'll see if I can get a better video done tomorrow.

 

edit: opps nvm

[3vi1-D4n]

Yeah its expectable that it will do this. You also have an echo chamber that basically makes it echo the sound out.

 

I have a similar set up for my M4 CQBR. Though the barrel is a lot longer and I didn't use an echo chamber or a noveske.

 

I find that the metal piston head is actually not as noisy as a bog standard one.

 

What I have is:

 

-CAR15 inner systema barrel.

- VFC outer barrel, CQBR length

- Bog standard marui birdcage

- M125 or equiv spring

- G&P piston

- Full unported cylinder (lots more air)

 

Accuracy is a lot better than with a short barrel, and muzzle velocity is a lot higher also. PLus I have foregrip space for a 7.4v 3000mah battery contained in a M33 RIS.

 

The cool part is with a marui birdcage it is possible to use an ICS QD silencer on it, immediately taking the noise away.

[scithe]

i would recomend a .01 barrel. with my g-spec it made a nice loud "crack!" i dont know how loud it will be with a gun firing at only 300fps though.

[wheaties]

Thats sick! about how much would you say it cost for the entire set up?

[danr]

while slightly related, but not an AEG, I figure I'd share my idea.

 

I bodged one of the sound hogs onto my Mac 11. Its quite annoyingly loud to shoot, and sounds quite impressive.

 

Another thing to take into account: Always test your setups while shooting BBs. It'll sound completely different (and generally not as impressive) if you are dry firing for testing.

[kevdude61]

And then there's always the old Noveske for added noise amplification.

[Docv400]

I really like the look of that Catman, except for the vertigrip, not a fan of those

Did you radius the front corners of the gearbox? It should last OK if you did/do.

[happy.al]

AAAARRRGGGHHHHHH, my eyes are bleeding, take it away, NO for the love all all things godly please kill it now.....

 

LOL, only joking, it's not quite the uglyest gun I've ever seen, it's about 3rd

 

It's being called his MILF gun

 

Mutilated

Irritating

Little

F***er

[Docv400]

Er, shouldn't that be MILF?

We all love MILFs right?

 

 

 

 

 

 

 

Military Imitation Lightweight Firearms...well what did you think I meant?

[charlieboy69]

lol

 

That looks pretty sweet, i was thinking of making a "loud" gun, but i desided I didnt have the monies or the time....however i have desided it wwould be better to make a loud crack sound, rather than a "a silenced sewing machine"

 

imaginary +1

[Agujereado]

I quite like that.

[Catman]

Cheers fellas, the vertical foregrip is only on there as a temporary measure - I too am not a big fan of them...sure is practical and nice to hold though! Hoping to put somekind of underslung 40mm or 27mm moscart launcher in the future.

 

Ok well the mic on the video camera just doesn't cut the mustard so I've had to try a mic plugged into the computer:

 

noisy_as_f2.wav

 

At first what you hear is a G36 firing - it's standard length barrel firing at around 328fps, so a pretty standard AEG. At around 10 seconds in is when this noisy b*****d starts shooting. And still the wav file doesn't do it justice, I only wish I had a decible meter.

 

It's really like a whip cracking next to your ear Put it this way, where I live is surrounded by fields and trees, when I fire the gun I get an echo back from the trees about half a second later

[EvilCookie]

Looks ugly but sounds meeeeeean

[Madmaxthe2nd]

any sound clips?

[RogueAngel]

Don't listen to em! The vertical grip looks great, got a sort of UMP style about it...

 

One word: MEAN

[Catman]

Hehe our club has a saying about ugly guns; "if it's ugly it must be good" For a little PDW style gun it's brilliant - plus I wanted to get use STANAG mags whereever possible (changed my G36 over too). Only thing is I wish the stock folded to the right instead of the left.

 

any sound clips?

yeah theres one in my last post

[StarMonkee]

I like that a lot. Gives a whole new meaning to "Looks can be deceiving"

[M15A4 CARBINE]

A lot louder than I expected. Nice Job!

[Ritifo]

Awesome. If it was practical, all AEGs should be made to sound like that.

[M4_Fanatic]

Not only does it looks good but it sounds like a beast!

I like it!

[Mike_West]

Too bad you can't ditch the stock, but at least it's a sidefolder, so the gun's still pretty much sex and candy.

And the Docter sight gets a thumbs up.

[DarkLite]

I once made my G3SAS really loud by installing a metal pistonhead and metal cylinder head, and then removed the buffer on the cylinder head. That was loud, though I wish they had noveskes when I tried.

[BigAl]

Only thing is I wish the stock folded to the right instead of the left.

 

Hell if your re building it out of new tube to hold a battery I'm sure a man of your talents could turn it upside down first, then it'll fold too the right.

 

Oh, if you do can you do me one too. I've got an LR300 stock knockikng about somewhere.

[Doncommie]

I skipped all the hard work and just bought a GR-300

 

I'm tempted to get a Noveske and put it on but I'm not sure if it will make much difference.

[scithe]

just a wild suggestion, have you thought about using the "bicycle to motorcycle" method? you know how they put the playing cards in the spokes? well maybe you could get a piece of plastic or metal bent at an angle or pyramid shaped and loaded on a spring. then glue or weld it to the side of the gun or gearbox so that it touches the spring or piston. if it is tense enough to make a noise against the spring or piston, but flexible enough not to cause problems, then that could make your aeg quite loud.