I absolutely love my ICS M4 too and would highly reccomend it to anyone. When I first got it I genuinly thought firesupport had sent me a metal bodied one by accident, no joke! After installing a tightbore and a prometheus purple bucking this thing has got unbelievable range.
A few problems that I should mention after half a year of skirmishing:
The C7 mags are 300 rounds BTW and one of mine has broken slightly. The small screw at the bottom of the mag managed to wiggle itself out and strip the thread slightly. I have managed to do a little repair job and it holds together but it isn't
