i have a pdi190 right now, but i dont actually know what it does so i didnt install it on my ak yet, can anyone tutor me on the springs? pdi, s, and m springs. what does it do, etc. and suggestion on what's better to put on my ak, cyma .42-s. thanks komrads

Whats your AK chronoing now?

all stock, 420 but goes to 450 sometimes. not really stable.

kom emperor, not bad for stock AK to have 450fps....its normal that fps fluctuates, that is because of your spring performance.....but as long as it kicks at 400++ fps, its still ok...... wait until your spring settles.....then that is the time you may wish to upgarde your ak....

hehe. komrad, di pa up pdi. should i upgrade it now?

your current fps should be good enough for field play. a bit too high for CQB. bottomline is, ano ba limits sa pinaglalaruan mo.

springs with M/SP prefixes indicates m/s rating. to get fps, multiply M/SP number by 3.28.


PDI uses a rating stated in % of stock marui spring.

all ratings are ideal, of course, so ung makukuha mo eh puedeng mas mababa o mas mataas sa ideal. depende 'yan sa setup at optimization ng ibang components.

springs are also typed as regular (linear), dual, or progressive (nonlinear) pitch springs. ung regular, linear (o pantay pantay) ang paglakas ng sipa ng spring. ung dual, dalawang level ang compression rate. ung progressive, almost geometric ang paglakas ng sipa.

PDI lang yata ang talagang gumagawa ng progressive or irregular pitch na spring.

nice input, idol Kom Zen!

he he he , , , just trying to help, as always, komrad BH.

Like i said before Cyma makes ak's with very high fps otb. Seen most of them like that. Matter of fact i had to detune 1 at OP irene because it just won't pass the regulated velocity limit.

No need to upgrade with it i would say for the moment. Shimming job though is a +.

komrads, i saw a thread po in filairsoft.com, about cyma etc. guns, and according to them, springs lang daw po and battery ang kailangan palitan. would that do? makakaya ba ng stock piston body ang li-poly batteries?

kaya kung stock spring pa rin, but rapid ang pagkasira nya. best to have a piston with all metal teeth para sigurado.

to optimize longetivity ng piston, whether stock or upgraded, make sure na maganda AOE (angle of engagement) ng mga contact surfaces ng unang ngipin ng sector gear at piston. after that, you may have to shave part of, or all, the 2nd tooth and also part of the the 3rd tooth of the piston.

Tamang tama pagkasabi mo komrad ZT.