Upgrading M4 S-System, guidance appreciated.

[akagi]

simple upgrade for you to reach mid 300s using .2

- PDI 150
- metal bushings (6mm) and shims

stock gears and stock marui motor (EG 700 - EG 1000) can easily crank this simple setup even using the stock 8.4v mini batt from marui.

(cheapest way..)

its up to you if you want to add the spring guide with bearing and other parts asap...

the stock parts can last longer depending on how you play....

if you want increase in ROF change your 8.4v batt to a 9.6v battery

hope this helps...