[dominik549]

Hello once again, recently a friend of mine gave me a broken M4 he said that he doesn't have the time to fix it so I can have it for free.
Now i know its not a long range aeg but I'm not so good with aeg-s i know how they work i know what parts are which and hell I know how to fix a few basic problems.
Now from the parts he changed, he said something about the gearbox but the gearbox runs fine I even checked the air seal and its good and the nozzle is moving fine. I tried replacing the hop nubs and hop rubbers but i think its the hop chamber

here is the problem the gun wont lift bbs, it shoots and they fall right in front of me , air seal as I said is fine but the hop chamber is kind of too tight for me, i know m4-s have some wobble in the chamber and most guns have a spring in there (which I don't know the function of) but this m4 (specna arms core) doesn't have one, but it looks like it had one, he rewired the gun to the front so wires are somewhat around the hop chamber.

So my guess is:
-the chamber is misaligned (by the wires myb there is an angle on it)
-the spring that used to be on there serves a big purpose and needs to go back on
-the chamber is somehow done for it and i need a new one

As I said I'm not a pro at aeg-s and I know you guys know more than me about it and myb had a similar problem so any advice would be helpful

 

[FMP Airsoft]

If you are talking about the spring that puts compression on the hop chamber, yes, that I'd important. Have you taken the gun to a chrono?

 

[SiliconeSword]

I was having this issue a while back before my F2, and I'm pretty sure it was the bucking being too tight.
You could sand the inside of the bucking lips, or you could double up the spring on the nozzle pusher arm thing so it pushes harder.
These days I'm struggling with the opposite, my nozzle has too much energy and is slapping the BB in too hard.

So yeah, either try some other buckings or sand down the inside of the feed lips.
If you sand too much, you can always put a ring of super glue on the outside of the feed lips to press them inwards when in the chamber.

 

[dominik549]

thanks for the advice everyone

yeah its that spring that holds the compression, im gonna put one back inside when i find one. and no i did not crono it

and for the buckings i did change out a couple of them it had little to no diffrence but you might be up to something, the way the buckings go inside even with sillicon oil its way too tight. im gonna try out what you said and the spring of the nozzle is pretty hard too so i dont think that is the problem.

 

[Plazmaburn]

I dont use the spring on the hop chamber, they typically do not work well. I use orings on the barrel infront of the chamber to space it to the gearbox. Works far better.

 

[kazuchan]

I dont use the spring on the hop chamber, they typically do not work well. I use orings on the barrel infront of the chamber to space it to the gearbox. Works far better.

what size of your O-ring use?

 

[SiliconeSword]

I would expect any old 7-8mm inner diameter ones