M120 spring upgrade
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:
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