ICS M4A1 Upgrading
I am going to buy ICS M4A1 fixed stock (ICS- 21) and I am going to install a Systema m120 spring and springguide with bearings. So I was wondering whether I should also replace the original gears, cylinder, cylinderhead and pistonhead for Systema`s.
Will Star LowCaps, TM LowCaps and G&P MidCaps fit to ICS?
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