Easiest option - correct AoE
(the cylinder head will fall out no doubt)
That should drop 10 to 15 fps
Just that one thing should do it
You could, remove the heavy 8mm alloy spacer inside the piston
you need a m3 nylon nut & penny washer
This will lose about 40fps I'd say as it will not compress the spring as much now
(it is about same as short stroking 3 teeth off - but you don't lose volume)
If it is a full size AK with a 455mm barrel you can't Short Stroke as you need max volume
Could SS a 74 with a 250~275mm barrel but need new piston with more metal teeth on rack
SS 1 tooth for a 400mm barrel
SS 2 teeth for a 350mm barrel
SS 3 teeth for a 300mm barrel
you can take an extra tooth off at a push but those are examples I tend to go with on volume
Don't worry too much if some most of this way over your head - just saying
If you drop spacer, then you need to improve seals, the o-ring is so-so on piston head
wrap ptfe around the cylinder head to seal better
could maybe change nozzle if you wish but there are two AK nozzle lengths
To be honest, the least amount of f*cking about - correct AoE
leave most of it alone perhaps and should be near 350fps
If you start improving seals you likely will hit 400fps
then you need to remove alloy spacer as well as AoE
I mean you should if you was going to do it correctly
gets seals really good, drop the alloy spacer, AoE, regrease etc...
Then pretty sure you should have a 350fps gun cycling more efficiently
and not needing to compress the spring quite as much
all for next to nothing
Or buy say a m95/m100 spring
but problem is some springs can come in a bit higher/lower than expected
generally you want a m95/100 for a full AK 455mm barrel
or maybe a sp85/90 if it is a Garder spring
(don't ask me about springs with percentages - fuctifino is the answer there)
Personally I'd work with what you got if you know it is 365fps and go from there
plus it is cheaper - no ordering of bits if you got asay a 22mm x 3mm rubber washer to correct AoE
Or get more involved with sorbo/silicone, ptfe, m3 nylon nut, new/stretch o-ring etc...
Still cheapy options working with what you got already but that is just my take on stuff
