The Forward Controls Design HSM has been designed to be wider than the width of a MLOK handguard's mounting base width at 0.75" to provide more surface contact. The HSM measures 1.25" wide, and provides better traction from the increased usable contact area with the user's hand. There is noticeable overhang on both sides of HSM on both sides, this is by design. The HSM is angled at 10 degrees and flares at the bottom. There are flutes on the sides designed to be a resting place for the user's finger tips, and serrations on 6 sides of HSM are to provide traction. A 1/8 Allen key is required for MLOK hardware installation (not included).