I have 3 airsoft KAC style vertical grips that have been chopped shorter and modded to fit m-lok rails. No hardware included but they work very well with magpul m-lok screws. Pic included in post shows them installed. 2 are painted as pictured one is not. The m-lok spacing for the grips is about 1.25 slots, so this just means they will need to go between 2 slots and cannot fit into a single m-lok space.
Any questions feel free to ask.