The Chalker Sling, designed by Command Master Chief Dennis Chalker, U.S. Navy retired, Plank Owner SEAL Team 6 and Red Cell. Versatile and durable, the Chalker snap shackle feature allows for rapid hook up or release from any weapon. It allows the user to access the strong or weak side with no line of sight interference! The Chalker is ideal for a gas environment, with no across the shoulder strap that can break your mask seal. When rappelling or fast roping, the Chalker allows for rapid reacquisition of your weapon when you come off of a rope. The Chalker is comfortable for long periods of time without any back, neck, or shoulder strain. Your primary weapon is always at the ready. the Chalker Sling can be used interchangeably on any SMG, Carbine, Shot Gun or Shoulder Mount Weapon, including 37mm and 40mm Gas guns.