ArmorMason M-LOK/ KeyMod Hand StopThe KeyMod and M LOK Barrier Hand Stop is a compact rail mounted accessory designed to attach to the bottom or side rail slots of a modern handguard and act as a fixed contact point for the support hand during shooting. Function and use: The body sits against the handguard and gives the support hand a positive stop to brace up against. This prevents the hand from sliding forward over the muzzle line and creates a repeatable hand position that can be