The M40 is a bolt-action rifle used by snipers of the US Marine Corps. Introduced by Remington in 1966, it has had four versions: the M40, M40-A1, M40-A3, and M40-A5. It is a lightweight, recoilless rifle that fires 7.62x51mm NATO (.308 Win) cartridges. The changeover to the A1 model was completed in the 1970s, the A3 in the 2000s, and the A5 in 2009. This rifle was used by renowned American snipers and war heroes in the Vietnam War, such as Charles "Chuck" Mawhinney, Adelbert F Waldron, Carlos Hathcock, and Eric R England.
A total of 995 M40 sniper rifles were built by Remington for US Marine Corps to be used in Vietnam. Original M40s were built on Remingtons’ model 700BDL actions, with one piece wooden stocks. Today each M40 is built from the Remington 700 bolt-action rifle, and is modified by USMC 2112 (Armorers) at Marine Corps Base Quantico, using components from a number of suppliers. New M40A3s are being built, and A1s are upgraded to A3s as they rotate into the armory for service and repair. The rifles have had many sub-variations in telescopic sights, and smaller user modifications. The M40A5 will incorporate a detachable magazine and a threaded barrel to allow for the use of a sound suppressor or other muzzle device.
Specifications of the M40 Sniper Rifle
Caliber: 7.62mm (.308)
Cartridge: 7.62x51mm NATO
Barrel length: 610mm or 24 in
Effective range: 800 m
Sights: Scout Sniper Day Scope (SSDS), which is a modified version of the Schmidt & Bender 3-12 x 50 Police Marksman LP II scope.
Weight: M40A1: 6.57 kg (14.48 lb)
Feed: 5 rounds in detachable box magazine
M40 Rifle on the range (video)