Originally Posted by
DreadPirateMoyer
Keymod being first to market will certainly make it harder for MLOK to gain traction. That said, on your points, I do think MLOK looks to be theoretically lighter due to the even greater amount of negative space. Bigger holes, less total material between holes (since the holes are longer, less total posts are needed between the holes), etc.
I could be wrong, but that's the way it looks from my engineering experience. Can you imagine a KMR-style rail with MLOK? It would be almost nothing but air (and would probably not be that strong; I'll leave that to the designers to figure out).