The VFC SCARS grip is not compatible with other M4 grips. I started working on making one fit but I've not had a chance to work on it recently. You basically need to make a spacer plate to fit between the grip & mechbox and get longer screws. You'll also need to get a longer motor adjustment screw on the grip plate. The reason for this is the mechbox sits higher in the lower receiver on the VFC version. The CA & STAR/ARES scars will work with out needing to mod them significantly. If you finnish it before me post some pics!!
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