No More M4 — USMC Adopts H&K M27 Infantry Automatic Rifle

Photo by USMC, public domain.

The U.S. Marine Corps will be adopting a new rifle to replace the M4 select-fire carbine. Designated the M27 IAR (Infantry Automatic Rifle), the new rifle is based on Heckler & Koch’s HK416, which looks like an AR, but runs with an internal gas piston system. The HK416 has been used by the German Army and some USA Special Operations units. This change-over has been in the works for some time, but the “protest period” has concluded, so now it is official.

The adoption of the M27 was announced at SHOT Show 2018. GunsAmerica reports: “H&K has officially received the contract for the USMC to replace the M4 carbines. The H&K model selected is the M27 Infantry Automatic Rifle, a derivative of the famous H&K 416″. The U.S. Marine Corps 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. In December 2017, the Marine Corps revealed a decision to equip every Marine in an infantry squad with the M27, so this is a major change. (Source: Wikipedia.com.)

According to Wikipedia: “The M27 is a lightweight, magazine-fed 5.56mm, select-fire weapon based on the Heckler & Koch HK416. It features a gas-operated, short-stroke piston action with a rotating bolt and a free-floating barrel. The handguard has four MIL-STD-1913 Picatinny rails for use with accessories and optics. The simpler gas-piston rifle system reduces the amount of time it takes to resolve malfunctions on the IAR compared with the M249 light machine gun.”

CLICK HERE for full-screen M27 Photo by Heckler & Koch.

As deployed, early versions of the IAR have done well in combat: “The IAR was initially fielded in December 2010. 1st Battalion 3rd Marines were deployed to Afghanistan in April 2011 with 84 IARs. Former SAW gunners initially did not like the M27, but appreciated it as time went on. It weighed 9 lb. loaded, compared to 22 lb. for an M249 — a significant difference when on 5-hour long missions. It also blended in with standard M16-style service rifles, making it difficult for enemy forces to identify the machine gunner. Marines issued with the M27 [report] it is friendlier to troops [than the M249] due to its cleaner, lightweight system having fewer moving parts and jams. IAR gunners consider the rifle-grade accuracy to be a huge improvement over the SAW, despite the loss of sustained firing.” (Source: Wikipedia.com.)