Hi I'm looking into getting various different exterior parts for my ICS M4-A1 so that its not just "Another M4 on the field" and becomes unique to the others...   Anyway, I hear ICS is a bit fussy so I'm not sure what would be compatible. At the moment I'm looking into getting a new stock, hand-guard, and maybe a grip... I like the look of the Magpul gear (sounds like everybody does ) so does anyone know if there compatible with my M4?   If not, then what alternatives are there?   Thanks,