M120 spring upgrade

[gaven555]

Hi,

I have a year and a half old systema metal bushings set and i am planning a on putting an m120 spring into my gun. I have a tokyo marui P90 TR. Is this a good idea? Near the end of this year im planning on installing a hammer 1300l besides a motor pinion gear and a new gear set what parts should i modify.

Thanks for your input! :cheers:

[ILLusion]

it'll be fine, although you may also want to look into upgrading to a polycarbonate piston and a spring guide with bearings OR a ventilated piston head with bearings... or both.