very weird problem: 3 mechboxes with 100 fps loss

[ShelledPants]

Is your hop up turned on? I've had weird problems with fps/misfeeding if the hop up is turned all the way off. Just a suggestion.

[Jimski]

I'v added a tightbore barrel and it still does not give more than 250.
I'm tired of this piece of shit.
I suspect the body and the hop up unit to be misfits, I'm pondering wether I should try with other ones or just stomp ragingly on the aeg and burn it with gasoline.

[Styrak]

I think you need to give it to me for cheeps

[Jimski]

not gonna happen

[lupo]

You may not have the right piston head to match the spring. Some of the systema piston heads need a high fps spring to properly expand the oring during the compression. If you have a weak spring the oring dosent get a proper seal. That is the only thing aside from the spring being mislabeled.

[Ronan]

You don't need 350 fps... considering your so trigger happy

[Kos-Mos]

Alright... after a few months... maybe you will consider dropping by my place (considering that it's 15 minutes from your place...)

[Jimski]

Originally Posted by lupo

You may not have the right piston head to match the spring. Some of the systema piston heads need a high fps spring to properly expand the oring during the compression. If you have a weak spring the oring dosent get a proper seal.

that is exactly what I am thinking.
but I still should get a high fps once in a while, shouldn't i ?

[Styrak]

Dude, it's been a months and you haven't solved the problem. Take it to a gundoc!

[Kos-Mos]

That piston head thing apply only if you are using a bore-up setup.

You could have mistakenly used a normal bore piston head, but the seal is so bad that you would have noticed right away.

Possible choices right now:

Broken cylinder head (mine had an hairline crack running from the "tube" to the bottom, and I lost over 100 fps)
Broken piston head (same thing happens)
Broken nozzle (again)
Broken mechbox
Craked/misaligned hop-up chamber
Ripped/twisted/torn hop-up sleeve

To test all these, you would need a complete working mechbox (unopened at first).

If the new mechbox works as it is supposed, you can sort out all the hop-up section.

Then swap the working parts with the parts from the non-working mechbox (one at the time, then re-assemble the gun COMPLETELY).

If you still want to do it, good luck. Otherwise, you know how to contact me.

[Jimski]

Originally Posted by Styrak

Dude, it's been a months and you haven't solved the problem. Take it to a gundoc!

you just don't get it, do you?

Originally Posted by Kos-Mos

That piston head thing apply only if you are using a bore-up setup.

mm sometimes I wonder, systema NB cylinders are really wide inside.

Broken cylinder head (mine had an hairline crack running from the "tube" to the bottom, and I lost over 100 fps)

will check

Broken piston head (same thing happens)

will check

Broken nozzle (again)

nope, nozzle is metal and its action seems ok.

Broken mechbox

will check

Craked/misaligned hop-up chamber

I bet there's definitely something with that.will re re re recheck, more.

Ripped/twisted/torn hop-up sleeve

nope, it's new.

thanks for the input! I know I'm stubborn

[Kos-Mos]

If you have a Deepfire metal nozzle, there is your problem.

I had to remove one from a G36C that had FPS/feeding issues.

Installed the stock one, and VOILA!

[Jimski]

ah??
interesting though I don't really believe...I've had that pb with both nozzles.