History and specifications of the U.S. Marine Corps' designated rifle SAM-R based on the M16 rifle

 The SAM-R (Special Applications Scoped Rifle) is a precision rifle used by the United States Marine Corps (USMC). It is a modified version of the M16A2 service rifle, which has been in use by the USMC since the 1980s. The history of the SAM-R can be traced back to the early 1990s, when the USMC began looking for a rifle that could provide better accuracy and range than the standard M16A2. The goal was to create a rifle that could be used by Marine snipers to engage targets at longer distances than was possible with the M16A2. The first version of the SAM-R was introduced in the mid-1990s, and it quickly proved to be a successful platform for snipers. The rifle was chambered in 5.56x45mm NATO and had a free-floating barrel, which helped to improve accuracy. It also had a match-grade trigger and a heavy, fluted barrel, which helped to reduce barrel heat and improve accuracy over sustained fire. Over the years, the SAM-R has undergone several revisions and upgrades. The most recent versi