Upgrading an ICS M16a3
I'm planning of buying a ICS M16A3 and making it into a semi auto aeg.
with this upgrade kit will it be able to use a sp120m/s aeg spring ?
Or what would be the strongest spring you can use without the gearbox breaking.
Will the stock gears break with that kind of spring ?
The upgrade:
special upper gear box type F with m120
upper gear box kit with metal spring guide,long barrel bore up cilinder full set,metal piston and m120 spring for all m4 ics
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