M40 (rifle)
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The M40 is a sniper rifle used by the United States Marine Corps. It has had three variants — the M40, the M40A1 and the M40A3. The M40 was introduced in 1966. The changeover to the A1 model was completed in the 1970s, and the A3 in the 2000s.
Each weapon is hand-built by USMC armorers at Marine Corps Base Quantico, using components from a number of suppliers. New A3s 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 scopes, and smaller user modifications.
The original M40 was a military type classified version of the Remington 700; it was factory-made, had a one-piece wood stock, and some other differences to later models. The M40A1 and A3 switched to fiberglass, and there were new scopes used as well.
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History
During the Vietnam war, the Marine Corps decided they needed a standard sniper rifle. After testing several possibilities, they ordered 700 Remington Arms [1] Model 40x rifles (target/varmint version of the Model 700 bolt action rifle) and given the M40 designation. Most had a Redfield [2] 3-9 power Accurange variable scope mounted. With time, certain weaknesses, primarily warping of the all-wood stock, became apparent. Sometime in the early 1970s, the USMC armorers at MCB Quantico began rebuilding the original M40s into M40A1s. The process involved, among other tweaks, replacing the original wood stocks with McMillan[3] fiberglass stocks as well as replacing the original Redfield scopes with Unertl [4] scopes.
The US Army also uses the Remington 700/40x action as the basis for its M24 SWS (Sniper Weapon System). The primary difference between the two rifles is that while the USMC M40/A1/A3 utilizes the short action version of the Remington 700/40x (designed for shorter cartridges, such as .308 Winchester, 7 mm/08 Remington, .243 Winchester), the Army M24 uses the long action version of the same rifle (designed for full-length cartridges, such as the 30-06 Springfield, and "short" magnum cartridges, such as the 7 mm Remington Magnum, .300 Winchester Magnum and .338 Winchester Magnum). The US Army reasoning behind this decision was to allow them to reconfigure the rifle in the larger, longer-range calibers if necessary. Whether or not they will do this is anyone's guess, but one might note that the British Royal Marines, among others, have adopted rifles in .300 Winchester Magnum and .338 Lapua as special purpose sniper rifles.
M40A3
Development of the M40A3 began in 1996, and the final product was revealed in 2001. Since then, numerous minor changes have occurred to the platform. It is highly possible that more changes will occur to the platform as it gains operational use in Iraq and Afghanistan. Listed here is the latest configuration known to be used in an M40A3.
Action - The M40 has always been based on the tried and true Remington 700 Short Action (as opposed to the Long Action in the M24), and this is no different in the M40A3. These actions are all chambered in 7.62 mm NATO and are house tuned by Marine armorers; the trigger guard assembly is manufactured by the DD Ross Company, though several M40A3s use Badger Ordnance trigger guards.
Barrel - The barrel is a Schneider 610 /24 inch (25 inch) 5-groove 1:12" match-grade heavy barrel.
Stock - All service M40A3s are based upon the A4 Tactical Riflestock, a high-quality benchrest-style fiberglass riflestock made by McMillan Fiberglass Stocks and cast molded in an OD Green color. The action is glass bedded into the stock with aluminum pillars, while the barrel is allowed to 'float' (it is attached only to the action), ensuring maximum accuracy. The stock has adjustable length-of-pull (through a buttstock spacer system) and an adjustable saddle-type cheekpiece.
Dayscope - A Schmidt & Bender 3-12x50 riflescope with illuminated reticle will replace the MST-100 Unertl type fixed 10x day scope currently used for the M40A3. The dayscope is mounted with Badger Ordnance Maximum scope rings, with a standard ring in the rear and a wider MAX50-brand ring in front, to allow for the mounting of a Badger Ordnance ringcap (enabling the mounting of SIMRAD add-on night vision devices).
Images
Comparison
| Differences | ||
| M40A1 | M40A3 | |
| Weight | 6.57 kg (14.45 lb) | 7.5 kg (16.5 lb) |
| Overall Length | 1.117 m (44.0 in) | 1.124 m (44.25 in) |
| Barrel | Hart | Schneider Match Grade SS #73 |
| Lands and Grooves | 6 | 5 |
| Stock | McMillan fiberglass | McMillan Tactical A4 |
See also
Lists:
- List of weapons of the U.S. Marine Corps
- List of individual weapons of the U.S. Armed Forces
- List of modern weapons
Related designation