Finally a handstop which can also be used as a barrier stop that can be used with M-LOK System, the IWC M-LOK Barrier Hand Stop... "IWC's reversible Barrier Hand Stop is designed with an integrated Quad-Point Grip profile on one half and an ergonomic resistance point on the other half. The Barrier face of the Hand Stop provides a force point to drive the firearm against an object, like a door frame, or for extra grip when wearing gloves.