![]() ![]() The ACOG also incorporates a rugged miniaturized reflex (RMR) sight for close quarters shooting at 100 yards or less. It also features a Trijicon ACOG Squad Day Optic, which sports 3.5 power magnification and allows target identification and precision fire out to distances of up to 600 yards. The weapon features a Harris folding bipod, giving it a stable shooting position while prone or from behind cover. Other factors further improve the M27’s accuracy. In the hands of a trained automatic rifleman, this scales upward, so the M27 will deliver rounds within twelve inches of the target at 600 yards. The M27, on the other hand, is approximately a two minute of angle weapon, meaning it will land rounds within two inches of the target at 100 yards. The M249 is first and foremost a machine gun and is accurate to about twelve minutes of angle, meaning rounds will hit within a foot of their target at 100 yards. The main difference between the M27 and M249 Squad Automatic Weapon, however, is accuracy. Instead of recycling hot, dirty propellent gases to cycle. Unlike the M4 carbine 9 the M27 uses the gas piston operating system, which uses a piston to drive the bolt. ![]() The IAR is based on the Heckler and Koch 416 rifle, which outwardly is very similar to the M4 carbine. The result is increased flexibility and more tactical options for the squad leader. In 2010, the marines introduced the M27 Infantry Automatic Rifle (IAR). Army infantry squad, the Marine squad has four more personnel and a third rifle team. These squads further divide into three fire teams led by a single squad leader, each of which has two riflemen, a grenadier, and an automatic rifleman. The Marine Corps, accustomed to heavy losses against strong enemy defenses and beach assaults, maintains robust, thirteen-man infantry squads. More accurate and capable of accomplishing its mission with fewer expended rounds, the M27 is now being considered as the front-line rifle not only for a handful of squad members but across the Corps’ front line units. Marines with the 2nd Reconnaissance Battalion have been armed in part with a new short-barrel variant of the services 5.56x45mm M27 Infantry Automatic. The adoption of the M27 Infantry Automatic Rifle over the older M249 Squad Automatic Weapon marks a return to that ethos across the service at the small unit level. Marksmanship, the ability to shoot accurately and service targets with the minimum expenditure of ammunition, has always been part of the Marine Corps ethos. ![]()
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