Experiences in Iraq and Afghanistan resulted in formal requests for recommendations. The key difference between a lighter infantry rifle and a more heavily built automatic rifle is the ability of the latter to maintain sustained continuous fire without: stoppages overheating the barrel or receiver or losing accuracy. Around 2000, the 1st Marine Division’s 2nd Battalion, 7th Marines Regiment conducted initial, limited IAR trials which confirmed the desirability of a light automatic rifle. In 1999, a Universal Need Statement was issued for an IAR. In December 2017, the Marine Corps announced that it would equip every member of an infantry squad with the M27, supplanting the M4 carbine which would be retained at the platoon leadership positions and above. Approximately 8,000–10,000 M249s will remain in service with the Marine Corps to be used at the discretion of company commanders. The USMC initially planned to purchase 6,500 M27s to replace a portion of the M249 light machine guns employed by automatic riflemen within Infantry and Light Armored Reconnaissance Battalions. It is used by the United States Marine Corps (USMC) and is intended to be issued to all infantry riflemen as well as automatic riflemen. The M27 Infantry Automatic Rifle ( IAR) is a 5.56mm select-fire assault rifle, based on the HK416 by Heckler & Koch. Typically Trijicon ACOG, flip-up rear rotary diopter sight and front post
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