WE 999c AEG help

[GroverA125]

I recently purchased a WE 999c from the my local site, when purchased its FPS was reduced significantly from the WE standard, as to be within site regulations of <350 FPS. When chrono-ed however it was concernibly low at 250 FPS. I previously owned a King Arms Sig 556, which had its original spring removed after internals were replaced/upgraded. Testing this spring in the 999c resulted in a dramatically higher FPS of 380 FPS, so now I am firing too hot. Problem is that I have no idea what spring I am looking at getting, as the vendors of these AEGs are not open with the spring power inside. What spring power would be put into these AEGs, and which should I purchase to put it into a reasonable FPS of around 325?

 

Alongside this, I have found that the Spring Tension Release whenever putting the gun into safe keeps jamming the guns semi-auto mode. Half the time it triggers, the trigger just clicks and I have to move to full-auto to allow it to fire again, sometimes vice versa. The problem arises that in semi-auto sites I cannot go into full auto. Is there any way I can prevent this from locking up my gun every so often?

 

Any idea about any of these problems?

[Samurai]

Only use the spring tension release at the end of the day.

M100 or M110 should get around that fps depending how good the airseal is. Or cut about 2 coils off the current spring.

[GroverA125]

Therein lies the problem: The Spring Tension Release on a 999c IS the safety. Whenever I put it into safe on the fire selector, it triggers the tension release.

 

As for the spring, that is what concerns me. The Sig was using the default spring and was hitting the same FPS so it was downgraded to an m90, putting it at 330, so I am unsure whether the Sig spring is closer to an m100 then an m90, but if that is the case then whatever spring was in the 999c in the first place must be much weaker than an m90. I mean, King Arms spring>M90 caused a 40 Fps drop, but King Arms spring>999c spring caused a 120fps drop. Does that mean the 999c spring is much weaker?

[Samurai]

There are a lot of factors affeting the fps. Even with perfect airseal. If there is bearing on the spring guide or not, bearing or weight on the piston head or not, etc. You can get very different fps from the same spring in different guns.

Especially with a used and possibly up/downgraded weapon. The only thing you can do is to try different ones. :/

[TheGrover]

Or do like i told you last night and leave it parked half tensioned for a bit, keep checking it every few hours and re-tensioning the spring until you have the right fps.

 

It saves you having to crack the gearbox and repeat the fiasco we had the other day trying to cram all those little v3 bits in there again