Ok, so mabey it would be best to go with G&G, and buy a SIR fore-grip for it, like the fore-grip from Capitalairsoft.ca.
Link:http://capitalairsoft.ca/store/index.php main_page=product_info&cPath=41_82_37&products_id= 281
And possible this airsoft gun.
EDIT: Also, If I bought a second RIS system, I may be abled to go the C8 way when I where my Canadian Forces loadout.
EDIT2: I found the JG M4 S-System, its like the ICS M4 SIR.
I just did a quick search on the forms, and found out it was ok.
EDIT 3: Found a whole thread on it
NSWDG Enthusiast, Milsim Junkie, Tactical Tailor, Kit Calibrator.
The rants & ramblings of an everyday Weekend Warrior.