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.

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.

I think you need to give it to me for cheeps :D

not gonna happen :D

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.

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

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

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

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

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.

you just don't get it, do you?


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

will check

nope, nozzle is metal and its action seems ok.

will check

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

nope, it's new.

thanks for the input! I know I'm stubborn :)

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!

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