[Jimski]

Heya all

I have these 3 mechboxes (all ver 3, 1 MP5k, 2 Steyr AUG ) I have upgraded with

-bearing spring guide
-SP 100 and 110 springs
-torque up gears on the 110

-all piston heads are ventilated
-AUG cylinders are stock
-systema unported cylinder on the mp5k
-guarder cylinder head on the 110 mechbox
-mosfet on the 110 mechbox


And they basically all are under the expected FPS, giving me around 240 fps each.

Everything is perfect mechanically, so I suspect problems of air sealing.
-rubber sleeves are good
-I have 2 barrels for the AUG and they BOTH produce that low FPS with both mechboxes, so the hop ups are probably not the guilty ones.

The 110 mechbox gave me more than 420 fps in the past with the same parts and different spring, so really I don't understand.

here are the places that could be bad airseals:

-cylinder heads ( mp5 is stock, aug 1 is stock and aug 2 has a guarder AUG head that is not very old)
-piston heads (the mp5 O-ring is BRAND NEW though)
-nozzles ( I ordered new nozzles but the ones I have are correct)

more than 100 fps loss: wtf ?

the only possible solution I have thought of until now is me being victim of a curse.
anyone has any idea ?

thx!