Originally Posted by Jpach
Sorry, I wasnt specific enough. I meant the kydex grip/mmg used as foregrips. Ive seen it done before and it seemed that people gave it the OK on a featureless build IIRC. Perhaps I recalled incorrectly?
Kydex as forward grip is good to go.
MMG *might* be a bad idea as you could potentially get a pistol style grasp on it, like the AFG. Used up front, it doesn't require you to actually be able to reach a trigger like it does in the normal pistol grip spot, so that's something to consider. I don't have a MMG to actually check it out.