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Description
date of existence: 1968

creator: Marines Weapons Command, Combat Development Command, Limited Warfare Agency

cartridge: 7.62×51mm NATO

Wielder: gregory paulson

he use of "sharpshooters " (or snipers) can be traced in U.S. military history from the time of the Revolutionary War of 1775–1781. Every U.S. military action since that time has required the special talent of such men. From 1955–1956, the United States Army Marksmanship Training Unit undertook a program to "reiterate the lessons learned" from past wars. However, this program was short-lived. The prevailing military attitude then envisioned any future conflict as nuclear with defeat or victory decided in hours.[7]
With the adoption of the M14 service rifle no provision was made for an M14 sniper rifle, [and] the designation of a sniper in the rifle squad was discontinued.[7] The conflict in Vietnam revived the need for snipers.[7] Snipers became optional and no table of organization and equipment (TOE) authorized sniper organizations [units]." However, units could train and deploy snipers on a limited basis depending upon...requirements.[8] As a result, U.S. Army snipers were trained in country in South Vietnam at Division.[ citation needed] During the Vietnam War, U.S. Marines were issued bolt-action hunting rifles, U.S. Soldiers were issued XM21 rifles. The Rock Island Arsenal converted 1,435 National Match (target grade) M14s by adding a 3-9x Redfield Adjustable Ranging Telescope (ART) and provided National Match grade (7.62 Lake City Long Range XM-118) ammunition. The ART scope, designed by 2nd Lieutenant James Leatherwood (U.S. Army), combined rangefinding and bullet drop compensation. The innovation came just in time as the U.S. military found itself losing servicemen to Viet Cong snipers who had the home field advantage in terrain that was, to say the least, difficult.[9]
This version, designated as the XM21, had a specially selected walnut stock and was first fielded in the second half of 1969. An improved version with a fiberglass stock was designated the M21 in 1972. The M21 remained the Army's primary sniper rifle until 1988, when it was replaced by the M24 Sniper Weapon System ; some M21s were later re-issued and used in the Iraq War .[10] [11]
In standard military use, the M21 uses a 20-round box magazine as the other members of the M14 family and weighs 11 pounds (5.27 kg ) without the scope. The U.S. military never officially authorized or purchased magazines in any other capacity, although 5- and 10-round magazines are available.
The M21 was criticized by an internal Fort Benning publication in 1989 warning that "The M21...cannot be maintained under field conditions, and its inflexible design makes it highly susceptible to malfunctions" due to the scope not being easily removable if needed and the glass bedded action that made disassembly in the field problematic.

The goal of the Crazy Horse rifle project was to offer current military units a reliable and cost-effective modernization program for Squad Designated Marksmen (SDM) using existing M14 rifles in inventory. The Crazy Horse rifle was designed in conjunction with the Picatinny Arsenal and the United States Army Infantry School .
The Crazy Horse rifle is built by Smith Enterprise Inc. and is used by various units within the US Military as the M21A5 and the M14SE. The Crazy Horse's metal components are cryogenically treated prior to assembly, which eliminates the need for bedding the stock with fiberglass and steel inserts. Additional upgrades include a completely adjustable trigger system (from 2.5 to 5 lbs) and an extended bolt handle for use in extreme cold environments.
The chamber is hand cut using chamber reamers specially designed for the M118LR round. Smith Enterprise Inc. is the only civilian rifle builder who uses these reamers. The gas system is unitized and hardened via Melonite . The gas piston is hard chromed to tolerances to ensure a precision fit within the hardened gas cylinder. Unlike traditional M14 rifles, the front sight is mounted on the gas block as opposed to the muzzle to allow use of a direct-connect sound suppressor that mounts to the Vortex Flash Hider . The scope is mounted to the rifle using a SEI scope mount and ring package made via electrical discharge machining (EDM).

Description
date of existence: 1968

creator: Marines Weapons Command, Combat Development Command, Limited Warfare Agency

cartridge: 7.62×51mm NATO

Wielder: gregory paulson

he use of "sharpshooters " (or snipers) can be traced in U.S. military history from the time of the Revolutionary War of 1775–1781. Every U.S. military action since that time has required the special talent of such men. From 1955–1956, the United States Army Marksmanship Training Unit undertook a program to "reiterate the lessons learned" from past wars. However, this program was short-lived. The prevailing military attitude then envisioned any future conflict as nuclear with defeat or victory decided in hours.[7]
With the adoption of the M14 service rifle no provision was made for an M14 sniper rifle, [and] the designation of a sniper in the rifle squad was discontinued.[7] The conflict in Vietnam revived the need for snipers.[7] Snipers became optional and no table of organization and equipment (TOE) authorized sniper organizations [units]." However, units could train and deploy snipers on a limited basis depending upon...requirements.[8] As a result, U.S. Army snipers were trained in country in South Vietnam at Division.[ citation needed] During the Vietnam War, U.S. Marines were issued bolt-action hunting rifles, U.S. Soldiers were issued XM21 rifles. The Rock Island Arsenal converted 1,435 National Match (target grade) M14s by adding a 3-9x Redfield Adjustable Ranging Telescope (ART) and provided National Match grade (7.62 Lake City Long Range XM-118) ammunition. The ART scope, designed by 2nd Lieutenant James Leatherwood (U.S. Army), combined rangefinding and bullet drop compensation. The innovation came just in time as the U.S. military found itself losing servicemen to Viet Cong snipers who had the home field advantage in terrain that was, to say the least, difficult.[9]
This version, designated as the XM21, had a specially selected walnut stock and was first fielded in the second half of 1969. An improved version with a fiberglass stock was designated the M21 in 1972. The M21 remained the Army's primary sniper rifle until 1988, when it was replaced by the M24 Sniper Weapon System ; some M21s were later re-issued and used in the Iraq War .[10] [11]
In standard military use, the M21 uses a 20-round box magazine as the other members of the M14 family and weighs 11 pounds (5.27 kg ) without the scope. The U.S. military never officially authorized or purchased magazines in any other capacity, although 5- and 10-round magazines are available.
The M21 was criticized by an internal Fort Benning publication in 1989 warning that "The M21...cannot be maintained under field conditions, and its inflexible design makes it highly susceptible to malfunctions" due to the scope not being easily removable if needed and the glass bedded action that made disassembly in the field problematic.

The goal of the Crazy Horse rifle project was to offer current military units a reliable and cost-effective modernization program for Squad Designated Marksmen (SDM) using existing M14 rifles in inventory. The Crazy Horse rifle was designed in conjunction with the Picatinny Arsenal and the United States Army Infantry School .
The Crazy Horse rifle is built by Smith Enterprise Inc. and is used by various units within the US Military as the M21A5 and the M14SE. The Crazy Horse's metal components are cryogenically treated prior to assembly, which eliminates the need for bedding the stock with fiberglass and steel inserts. Additional upgrades include a completely adjustable trigger system (from 2.5 to 5 lbs) and an extended bolt handle for use in extreme cold environments.
The chamber is hand cut using chamber reamers specially designed for the M118LR round. Smith Enterprise Inc. is the only civilian rifle builder who uses these reamers. The gas system is unitized and hardened via Melonite . The gas piston is hard chromed to tolerances to ensure a precision fit within the hardened gas cylinder. Unlike traditional M14 rifles, the front sight is mounted on the gas block as opposed to the muzzle to allow use of a direct-connect sound suppressor that mounts to the Vortex Flash Hider . The scope is mounted to the rifle using a SEI scope mount and ring package made via electrical discharge machining (EDM).