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well, just a piece of advice from me.
ICS M4A1 is already a better gun compare to those other company that produce M4 beside real steel. You don't need to upgrade anything is nothing going wrong with them. I already open both of the clear ICS M4 and the full metal ICS M4 which both of them are the new version coming out, the internal are basically the same. I drop at least 5 k to 8 k in stock form, there is nothing break yet. I suggest you to keep as it is.
By the way, the accuracy of ICS M4 is way better than regular M4 because of their Hop up design, it's very consistent every shot, once you set the hop up right then it will stay there forever, again thanks to ICS M4 hop up design. Don't think to modify regular M4 hop up to fit, it's worst of time and money, better buy ICS M4 hop up.
If I were you, I would consider to buy another upper mechbox than consider to upgrade the internal of the gun. Keep it as stock and use until it's break.
By the way, I turn to like ICS M4 piston. I broke 2 systema piston already with another upper but my stock on the other upper still show any signs of wear yet. Both upper shot approximately 5000 round each. That systema piston last me only around 5000 rounds.
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