The M27 Infantry Automatic Rifle replaced the M249 SAW in USMC fire teams. Based on the HK416, it fires from a closed bolt for improved accuracy. The USMC expanded its role to replace the M4A1 as the standard USMC infantry rifle. Type: Semi-Auto Rifle Action: Gas-Operated Caliber: 5.56x45mm Capacity: 30 Year introduced: 2011, Germany/USA Weight: 7.9 oz Overall length: 33" Status: Active Military use: Yes Intended use: Military, Service Rifle