Confused, silencer making AEG louder???? What's going on here?

CpcRc

Hey,
I recently installed a new precision barrel into my APS M4. The barrel is a version II madbull phyton 6.03mm and is 407mm in length. I could not get a 363mm version which would roughly match my AEG's stock inner barrel so I got a 407mm.

Upon installing the barrel I had to disassemble my hopup because the guarder clear hopup rubber was a bit worn so I threw in a G&P rubber that was lying around from when I installed a G&P metal hopup unit a few months back. Installing the barrel and sorting the hopup unit took a few attempts to make sure it had a reasonable seal.

I had to get a silencer to cover the extended barrel that is 110mm in length.

Now to the problem, when I test fired the AEG it was actually noticably louder that before. Each shot seemed to sound a bit like a low pop/thud (a hybrid between the two) noise. This was quite a bit louder than the AEG used to sound. At first removing the silencer didn't make much difference.

So after I was sure the hopup unit seemed to be fine, I opened the gearbox (this was not my first gearbox that I had opened and not the first time I had opened this particular one).

Previously when I had opened the gearbox I had swapped the spring guide in it for a bearing spring guide from my Dboys SCAR which was made of plastic and metal. I noticed that the spring was catching a little on the spring guide and replaced it with a full metal non-bearing spring guide. I also installed some bearing bushings while I was looking through the gearbox.

After I had reassembled the AEG I noticed that when I fired without the silencer that the AEG sounded a lot more like it had before, but still quite the same. I then tested it with the silencer on and it still was making loud noises when fired. I tried removing some of the foam rings inside the silencer and spacing them out and the AEG was still making the pop/thud noise. Now the noise is not as before but I'm still wondering what is happening?

So could someone please shine some light on this topic? Because I'm puzzled

Thanks.

CpcRc

Sorry, I had only dry fired before and tried out the AEG with BBs there in target practise and it sounds much better. So it seems to be going fine for now. Mods can close this thread if they like. Sorry about the confusion.

F.U.B.A.R

maybe the longer barrel increases the sound and also if a silencer is completely hollow would that create resonance in the barel that could also contibute to a losder sound couldent it?

CpcRc

The longer barrel probably does contribute to the sound, a mismatched inner barrel length and cylinder maybe but I don't know much about that.

The silencer was filled with foam in the beginning but I removed one ring of foam and spaced out the others. Spacing the foam rings inside a silencer can help change the sound generated with each shot of your AEG, enhancing the silencers affect but this can decrease the fps slightly of your AEG slightly due to slight air dispersion in the gaps but it is pretty negligible compared to the sound difference. I know people who have tried this to make their AEGs sound different when firing.

The reason I was worried was because my AEG didn't sound anything like an AEG with a silencer usually does, this is comparing it to the sound of my AUG A2 which has a gemtech halo silencer. I was worried if it was an unhealthy sound.

But when I test fired my AEG this evening with BBs and not dry firing it like earlier, it sounded a lot more like an AEG should when it has a silencer fitted. Also my hopup wasn't working properly before I opened it today and now it works much better. All in all, it seems to be ok apart from a slight thang (closest I can describe it) noise from the spring with each shot. But I have noticed that the AEG isn't completing a full cycle on semi sometimes and can leave the spring slightly compressed. But seeing as I'm getting an active braking mosfet this week this shouldn't be a problem in the future.

Thanks for the input FUBAR

sniper on duty

by putting in a tighter barrel u are creating a better air seal arround the bb's traveling up the barrel thus giving u that extra little pop on exiting the barrel, also your getting more FPS too, the air is compressed a bit more so it creates a louder sound on the exit from the barrel,

this is just what i think, i could be wrong,

F.U.B.A.R

I know that sound it comes and goes in my M4 and it has a mosfet fitted so??? also what if you were to replace the foam spacers with solid plastic ones at uneven intervils would that have a greater/ worse effect?

CpcRc

@ FUBAR

I don't a lot about silencers only what I know from first hand experience with my own AEGs and friends AEGs. I don't know the advantages/disadvantages and/or difference between using foam or solid material inside a silencer. I also don't know the difference between using even and uneven intervals as I haven't experimented with them.

Is your mosfet active braking? I'm getting mine as part of an order with friends and we are getting active braking mosfets rather than regular mosfets.
A regular mosfet protects the trigger contacts and improves gearbox responsiveness and performance. An active braking does all that as well as ensures that there is always a complete cycle on a semi fire shot.

F.U.B.A.R

oh rite no I dont have an active breaking one I think but I get twang sound on full and semi so is this the ame as your problem or worse?

CpcRc

I think it's similar alright. I'll know for sure if the mosfet works when I get it and install it. I know that it effected the sound of my friends AEG when he installed it and I'm getting the same mosfet.

F.U.B.A.R

Cool let me know how it goes

CpcRc

Finally got the mosfet fitted last night, had to open up the AEG another few times today though to adjust a few things again. So now the M4 is sorted and working properly, it isn't louder (a little bit quieter with the mosfet), has a snappy trigger response, and good range and accuracy.

It took a while to get things sorted but it was worth it. The active braking mosfet works great and was needed as the piston was properly resetting itself before (very annoying when trying to disassemble).

F.U.B.A.R

thats good to hear mate happy hunting

CpcRc

Actually I'm leaving the country tomorrow, but thanks.

So no airsoft for a while but glad to have it sorted before I go at least.

F.U.B.A.R

yeah Iam leaving soon meself best of luck on your travels