For those who prefer M-LOK-style rail attachment devices, Ergo Grips has a cover option that allows users to seal up unused M-LOK slots and provide an extra gripping surface.
The M-LOK Wedgelok Slot Cover is a heat-resistant molded material made from Santoprene that fits into empty rail slots on an M-LOK fore end. The construction of the covers provides a non-slip gripping surface that forms to the profile of a rifle's rail and provides extra purchase. The outside of the covers features and aggressive texture to improve grip.
The Ergo Grips M-LOK Wedgelok Slot Cover comes in two different sizes. One size covers four M-LOK slots and is 6.25 inches long and 5/8 of an inch wide. The other size covers seven M-LOK slots. Each size option comes in black, dark earth, OD green, graphite gray, pink, purple and robin's egg blue. A four-pack of Wedgelok covers retails at a suggested price of $21.95.