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hmm, clinder head, you can upgrade to a metal one if you want.
Maybe look at a cylinder set. Comes with cylinder, cylinder head and a poly carb piston head
Name ZS-03-13
Description Systema N-B Cylinder Set For AK
Suitable For:AK47/47S ...
Price US$ 53.60 Weight 0g
and the poly carb piston is
Name ZS-05-01
Description Systema Poly Carbonate Piston
Suitable For Gearbox Version 2 & 3 ...
Price US$ 22.50 Weight 0g
Upgrading gets expensive. You dont even need to upgrade the piston or piston head, but its always an option as it is better than stock
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