Group - Mk 1 Underwater Defense Gun

 

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The M1 Underwater Defense Gun, also called the Underwater Defense Gun Mark 1 Mod 0, is an underwater firearm developed by the United States during the Cold War. Like other underwater firearms, it fires a special 4.25 inch metal dart as its projectile. The gun was developed as part of a project called TDP 3801 during the 1960s, and much of the work on it occurred at the Naval Surface Weapons Center White Oak Laboratory in Silver Spring, Maryland. Originally, the idea was for a rocket-based weapon similar to the Gyrojet family of firearms, but rocket-powered weapons proved to be expensive and inaccurate, so alternatives were researched. The result was the Mk 1 Underwater Defense Gun, introduced in the early 1970s. It proved effective but, says Tom Hawkins of the nonprofit Naval Special Warfare Foundation, "It was bulky and heavy and the men never warmed up to it. It was also a signature controlled item -- as in signing your name to check it out -- and administratively a burden to the operational units." In 1976, the Heckler & Koch P11 was introduced, and it soon replaced the Mk 1. The Mk 1 is a double action only pepper-box weapon, and its removable cylinder magazine fits into the side of a gun, being inserted and removed through a door on the left side of the gun. The frame, cylinder, door assembly, and action are made of aluminum, the trigger is made of self-lubricating nylon, and all other parts are made of stainless steel. The magazine holds six rounds. 



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