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Mk 18 Mod 0 grenade launcher
The Mk 18 Mod 0 was a 40x46mm grenade launcher used by the US Navy during the Vietnam War and also the last known hand crank operated firearm since the Gatling Gun. It has been replaced by the Mk 19 in service with the United States Armed Forces.
==Design==
This weapon is a manually operated, belt fed, rapid-fire 40mm grenade launcher designed to provide coverages of targets with high explosive fragmenting grenades. It will fire at variable rates up to 250 rounds per minute at ranges from approximately 328 yards to 2,200 yards. The rotary split breech, utilized in this weapon, allows straight through feeding of ammunition and eliminates the need for a reciprocating bolt, extraction of ammunition from a belt, extraction from a chamber and ejection for the weapon.The 40mm Mk18 utilizes a split breech concept which has been previously used but has some original characteristics based on the introduction of a mechanism to allow the top rotor to move vertically and synchronizes the bottom rotor. Between 1965 and 1968, approximately 1200 of the Mk18 Mod 0, 40mm Multiple Grenade Launchers were produced by the Honeywell Corporation and Aeronautical Products Division, Hopkins, Minnesota. The first patent application was filed by Honeywell in 1964, however, the initial development work commenced in late 1962. The concept was originally proposed during a study on the behavior of fuzes for the M79 grenade launcher ammunition. Honeywell had anticipated the need for a simple, inexpensive and extremely mobile rapid fire weapon that could provide a team of two men with an effective capability for delivering large quantities of explosive grenades within a limited range primarily for suppressive and defensive fire purposes. The development of the 40mm cartridge grenade with its two stage propelling system (essentially an impulse system) made such a weapon possible. The high-low pressure propelling system utilized in the 40mm cartridges permits the use of a split breech mechanism which allows the weapon to be extremely light and simple
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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