Hey-yo! Well I can't speak too much about ICS, etc. But I have recently purchased a G&P M4A2 (fixed stock).
So far, so good. I'm loving the AEG. It's solid, shoots great.
Though it does involve a tad of fine tuning to make it shoot true.
As for upgrades, depends on your preferance, though keep in mind certain fields will specify FPS. As was mentioned go for around 350 - 380, there really isn't much need for anything more.
Upgrades for an M4? PLENTY!
Conversions, grips, stocks, rail systems, m203's, supressors, etc. So for mods, no need to worry, you can customize to your hearts content!
Hope this helped!
Good luck on your decision!
:cheers:
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