![]() This, along with its 9.5-lb overall (OA) weight should significantly reduce barrel rise (a.k.a. ![]() Hinckley informed us that Colt Defense may add this feature on a future revision of the weapon.ĭue to the large heat-sink component situated under the barrel, the Colt IAR is somewhat front-heavy a.k.a. Gas Impingement Sleeve, which was designed to control the cyclic rate/ROF over the life cycle of the weapon. The Colt IAR utilizes a monolithic upper receiver that incorporates a Mil-Std-1913 "Picatinny" quad rail system/forend rail tube which contains a rather large heat sink to prevent cook-offs.ĭefenseReview has been informed that Colt IAR doesn’t utilize Colt’s proprietary and patent-pending Gas Regulator Sleeve a.k.a. Colt went with the direct gas impingement system because “there was no improvements to the reliability of the weapon when properly maintained, and the overall weight was lower with the gas impingement system,” according to Phil Hinckley, Executive Director of Quality and Engineering at Colt Defense LLC. Interestingly, the Colt IAR operates via…ĭirect gas impingement, not gas piston/op-rod. round and is designed to "satisfy the role currently played by the FN M249 SAW in a lighter, more man-portable mode" (Colt’s words) at significant cost savings vs. The Colt IAR is chambered for the 5.56x45mm NATO (5.56mm NATO)/.223 Rem. While I was visiting Colt headquarters last month, I got the chance to handle the Colt IAR (Colt Infantry Automatic Rifle) candidate. Colt Defense, LLC provided the first/top photo. "SMGLee" at the 2008 AUSA Annual Meeting and Exhibition, and he owns the copyright on these photos. All of the photos contained in this article, with the exception of the first/top photo, were taken by Chen Lee a.k.a.
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