The M3 trench knife or M3 fighting knife was an American military combat knife first issued in March 1943. The M3 was originally designated for issue to soldiers, not otherwise equipped with a bayonet. However, it was particularly designed for use by forces in need of a close combat knife, such as Airborne Units and Army Rangers, so these units received priority for the M3 at the start of production. As more M3 knives became available in 1943 and 1944, the knife was issued to other soldiers such as Army Air Corps crewmen and soldiers not otherwise equipped with a bayonet, including soldiers issued the M1 carbine or a submachine gun such as the M3 submachine gun "grease gun".
The M3 trench knife was developed as a replacement for the World War I-era U.S. Mark I trench knife, primarily to conserve strategic metal resources. The M3 would also replace the Fairbairn–Sykes fighting knife or OSS dagger in U.S. service in 1944. In August of 1944, the M3 fighting knife evolved into the M4 bayonet for the M1 carbine with the addition of a bayonet ring to the hilt and a locking mechanism in the pommel.
Designed for rapid production using a minimum of strategic metals and machine processes, the M3 trench knife used a relatively narrow 6.75-inch bayonet-style spear-point blade with a sharpened 3.5-inch secondary edge. The blade was made of carbon steel, and was either blued or parkerized. Production of the grooved leather handle was later simplified by forming the grip of stacked leather washers that were shaped by turning on a lathe, then polished and lacquered. The steel crossguard had an angular bend at one end to facilitate a thumb rest.
The M3 was developed as a replacement for the World War I-era U.S. Mark I trench knife, primarily to conserve strategic metal resources. The prototype for what became the M3 was evaluated in December 1942 by the civilian board of directors of the Smaller War Plants Corporation Board (SWPC) against another competing design, the US Marine Corps' KA-BAR fighting utility knife.
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The M6 Bayonet is a bayonet used by the U.S. military for the M14 rifle, it can also be used with the Mk 14 Enhanced Battle Rifle as well M39 Enhanced Marksman Rifle. It was introduced in 1957, at the same time as the rifle itself. It is the only bayonet made for the M14. Like its predecessor, the M5 bayonet for the M1 Garand rifle, the M6 was intended to serve additional roles as a combat knife and utility knife. The basic blade design was like the M4, M5, and later M7 bayonets, based on the World War II designed M3 Trench Knife.
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