Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. The M27 Infantry Automatic Rifle (IAR) is the name given to a lightweight, magazine-fed 5.56mm weapon sought by the United States Marine Corps, which is intended to enhance the automatic rifleman's maneuverability and displacement speed. The Marine Corps is planning to purchase 4,100 IARs to replace 2,000 M249 light machine guns currently employed by automatic riflemen within Infantry and Light Armored Reconnaissance Battalions.