G&G SR 25 piston.

[Stubby12345]

Hi folks,

I was wondering if anyone knows how many teeth are on the G&G sr25 piston ?
I'm buying all the upgrade parts before going ahead installing them as I only want to open the gearbox once (hopefully). Also if anyone can enlighten me as to whether an aluminium or plastic piston would be better as I've heard pros and cons of both. The spring in the gun would be either an sp130 or sp140 (guarder) so roughly 430-480 fps depending on which spring I go for.

Thanks in advance for any help.

Gareth.