The M24 SWS (Sniper Weapon System) is the military and police version of the Remington 700 rifle, M24 being the model name assigned by the United States Army after adoption as their standard sniper rifle in 1988. It is also used by the Israeli Defence Forces (IDF). The M24 is referred to as a "weapons system" because it consists of not only a rifle, but also a detachable telescopic sight and other accessories.
The United States Marine Corps also employs another variant of the Remington 700 as their standard issue sniper rifle, with the model name M40. The main difference between the M40 and the M24 is that the M24 uses the "long" version of Remington 700 receiver versus the M40's "short action". The M40's short receiver is dedicated to cartridges that do not exceed the length of the issue 7.62 mm NATO round. In contrast, the M24's longer receiver allows the rifle to be converted from 7.62 mm NATO to the more powerful .300 Winchester Magnum cartridge. The U.S. Army specified this capability in case future tactics required the larger cartridge's extra range and penetration.
FM 23-10 SNIPER TRAINING (http://www.globalsecurity.org/military/library/policy/army/fm/23-10/ch22.htm#s2p1) "M118 Special Ball Bullet. ... Its spread (accuracy standard) for a 10-shot group is no more than 12 inches at 550 meters (fired from an accuracy barrel in a test cradle)." M118 accuracy is no more than 1.9 MOA . M24 + M118 accuracy is worse (about 2-3 MOA).
Special Operations requires night vision image intensifier. (U.S. Special Operations Command, night vision intensifier sight for M24 Sniper Weapon System) (Defense Procurements)
Apr 14, 1992; * SPECIAL OPERATIONS REQUIRES NIGHT VISION IMAGE INTENSIFIER. The U.S. Special Operations Command has a requirement for an add-on...