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La France M16K
The La France M16K is a M16 rifle modified by the company La France Specialties, which among with other firearm-related activities, convert common military weapons into more compact configurations typically for law enforcement and special forces use.
The M-16K was designed by Timothy F. La France, the principal of La France Specialties, formerly of San Diego, California, for use by persons anticipating ambush while in transit. Its short length and unique sighting system was designed to facilitate firing from moving vehicles, where the extra length of even a CAR-15 or XM-177 might create a problem. Its extremely compact envelope also makes it an ideal weapon for helicopter crews, who otherwise would be forced to rely on sidearms for protection in the event of a forced landing.
==Design==
The M16K is a so-called "K" weapon ("K" standing for the German word Kurz meaning short). The La France M16K, was basically a standard military M16 rifle, chambered for the standard issue 5.56 mm cartridge with an 8 3/8 inch (213 mm) barrel. The standard barrel length is 20 inches (508 mm). Like many automatic and semi-automatic weapons the M16 utilizes pressure from the propellant gases in the barrel to cycle the bolt of the firearm. Most automatic weapons use a mechanical device such as a rod and piston between the bolt and the propellant gases. This is not the case in the M16 design in which gases are tapped off the barrel near the muzzle and flow though a tube to directly impinge on the bolt to initiate the auto loading cycle. In a standard issue M16, the gas tube is roughly 16 inches (406 mm) long to produce an automatic (cyclic) rate of fire of approximately 650 rounds per minute. Shortening the barrel increases the rate of fire significantly and thereby makes the weapon difficult to control and less reliable. To use a significantly shorter barrel than the standard issue without increasing the rate of fire, La France designed (and subsequently patented) an adjustable gas system that would keep the rate of fire the same as with a full-length barrel.
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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