M27 Infantry Automatic Rifle

The M27 Infantry Automatic Rifle (IAR) is a 5.56mm, select-fire assault rifle, based on the HK416 by Heckler & Koch. 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 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. Approximately 8,000–10,000 M249s will remain in service with the Marine Corps to be used at the discretion of company commanders. 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.

M27 Infantry Automatic Rifle
M27 IAR with ACOG Squad Day Optic and AN/PEQ-16A weapon-mounted laser module with visible laser, infrared targeting laser, infrared illuminator, and white light
TypeSquad automatic weapon
Assault rifle
Designated marksman rifle (M38 DMR)
Place of originGermany
Service history
In service2010–present
Used byUnited States Marine Corps
WarsWar in Afghanistan
Syrian Civil War
Production history
DesignerHeckler & Koch
Designed2008
ManufacturerHeckler & Koch
Unit costUS$1,300
Produced2010–present
No. built14,100
Specifications
Mass7.9 lb (3.6 kg) empty
9.8 lb (4.4 kg) loaded weight with sling
Length36.9 to 33 in (940 to 840 mm) with adjustable stock
Barrel length16.5 in (420 mm)
10.4 in (260 mm)
Width3.1 in (79 mm)
Height9.4 in (240 mm)
Cartridge5.56×45mm NATO
ActionGas-operated short-stroke piston, rotating bolt
Rate of fire
  • Cyclic rate: 700–900 rounds/min
  • Sustained rate: 36 rounds/min
Muzzle velocity2900 ft/s (884 m/s)
Effective firing range550 m (600 yd) (point target)
700 m (770 yd) (area target)
Maximum firing range3,938 yd (3,601 m)
Feed system30-round STANAG magazine
SightsTypically Trijicon ACOG, flip-up rear rotary diopter sight and front post
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