The barrel is held by an improved barrel nut offering more bearing surface for a tighter fit. The one-piece upper receiver provides complete zero retention for mounting optics. Quad MIL-STD-1913 rails permit any comprehensible accessory to be mounted with ease. A full length top rail spans from the charging handle to the front sight base. The upper receiver is made with Colt’s 1-piece upper receiver (actually two pieces due to the bottom handguard being removable) which offers several enhancements to the weapon. The IAR incorporates the same safety features and human engineering features as the M16/M4 series of weapons. The IAR is based on the time tested and combat proven M16/M4 series rifles. The Colt IAR6960 is a lightweight, gas operated, magazine fed, 5.56x45mm caliber automatic rifle. The left side of the IAR with a closer look at the heat sink as well as the Grip Pod. The IAR must also be able to mount the standard Marine Corps Multi-Purpose Bayonet (NSN 1095-0).ĭevelopmental contracts were awarded to Colt Defense, FN Manufacturing Inc and Heckler & Koch.Ĭolt Defense was awarded developmental contracts for two of their entries, the IAR6940 and the IAR6940H. The IAR must use Mil-STD-1913 dimension rails and a BUIS. issue 5.56mm ammunition and use the standard M16/M4 magazine. Interface requirements required compatibility with the full range of U.S. Other features include a four position stock and a handguard to protect the shooter’s hands from heat. The weapon is to have both semi and fully automatic modes of fire and be finished in Coyote Tan. The rate of fire of the IAR must be capable of 36 rounds per minute for 16 minutes and 40 seconds without a barrel change or cook-off of the round in the chamber or magazine. The probability of hit should be a minimum of 2 rounds from a 5 round burst onto an “E” silhouette at 50 meters 70% of the time within 3 seconds of target exposure. Precision automatic fire is required and to demonstrate less than 8 MOA with 5 round bursts. The IAR shall be less than 40 inches in length and demonstrate less than 4 MOA dispersion in automatic fire. Performance characteristics including the IAR must weigh less than 12.5 pounds with the Grip Pod™ and BUIS attached. Notice the Norgon ambidextrous magazine catch. This included the Matech BUIS (NSN 1005-0), Blank Firing Adapter, Grip Pod™ (NSN 1005-01541-1712), three point sling (NSN 8465-0), cleaning kit, operators manual and sufficient magazines to hold 300 rounds of 5.56x45mm NATO ammunition.Ĭlose view of the left side of the receivers of the IAR. The Marines specified the kit which would accompany the IAR. The magazine feed system on the SAW has been mediocre at best in the area of reliability. Having a magazine fed weapon utilizing the proven M16/M4 magazine would also create better commonality and reliability in the IAR. Others believe a lighter, more reliable magazine-fed weapon will increase maneuverability, accuracy and mobility. Some feel the M249 is the center of the unit’s firepower and the belt fed capability is essential to get out heavy volumes of firepower. The feelings throughout the Marine infantry community are mixed on the concept of the IAR. The purpose of the IAR is to replace the M249 Squad Automatic Weapon (SAW) with an automatic rifle easily manned by a single infantry marine that has emphasis on light weight and portability in order to maximize dismounted maneuverability. The Marines were seeking designs which would fit very specific parameters. Marine Corps submitted a Purchase Description for the Infantry Automatic Rifle (IAR) to the industry. M38 Designated Marksman Rifle M27 fitted with the Leopold Mark 4 2.5-8x36 MR/T TS-30A2 riflescope.On 27 March 2008, the U.S. Variants M27 Infantry Automatic Rifle Light support weapon. The M27 was adopted in the USMC to replace some of the M249 Light Machine Gun. The M27 Infantry Automatic Rifle (abbreviated as M27 IAR) is a infantry automatic rifle developed from the HK 416 in the late 2000s.
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