Samson Manufacturing Corp. MLOK Hand Stop, Black 04-01021-01 Introducing the Samson M-LOK Hand Stop/Barricade Stabilizer. This product is CNC machined from aircraft grade 6061-T6 aluminum and equipped with two M-LOK mounting screws for maximum strength. It features aggressive waffle cuts for gripping barricade surfaces. Used as a hand stop" it keeps your hand from moving forward of the handguard for safety with short barreled rifles. Samson's M-LOK Hand Stop/Barricade Stabilizer keeps things under control.