The M6 is a series of carbines designed and manufactured by LWRC International. It is based on the M4 carbine, with which it shares 80% of its parts. [2] The 'M' model name is not a US military designation.

It was employed by selected members of the USMC squad to provide light machine gun suppressive fire. The LWRC IAR has dual fire modes. In semi-automatic, it functions closed bolt.

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LWRC为参加美国海军陆战队IAR竞标而研制的样枪， LWRC IAR 是基于LWRC SRT 活塞式导气系统 的一种衍生型。 LWRC IAR最大的特点是采用类似FG42的射击方式：在半自动模式时采用闭膛待击，在全自动模式时变成开膛待击。

The M27 Infantry Automatic Rifle (IAR) is a 5.56mm, select-fire assault rifle / squad automatic weapon developed from the HK416 by Heckler & Koch.

Feb 19, 2009 · As of this writing, LWRC is entering a submission into the Marine Corps Infantry Automatic Rifle (IAR) program. This is a highly modified version of their proven piston system with the addition of a closed bolt semiautomatic operation and an open bolt fully automatic operation.

6 days ago · The IAR sample from LWRC is also based on AR-style weapons, derived from the LWRC SRT (a gas piston M4 carbine from the company). The LWRC IAR shares a feature with the FN IAR—closed-bolt for single fire and open-bolt for automatic fire.

Dec 31, 2018 · This is the LRWC M6-based IAR contender. It, like the FN and Colt entries, was passed over in favor of the HK416-based IAR. However, aside from the HK416, it was the closest (at least in external appearance and function) to the mainline rifle it was based on.

Jan 22, 2008 · DefenseReview has been waiting for a white paper on, and LRIP (Low-Rate Initial Production) photos of, the Land Warfare Resources Corporation (LWRC) open-bolt full-auto, closed-bolt semi-auto Infantry Automatic Rifle (IAR) candidate weapon since July 31, 2007, when we received the following message (in italics) from Darren Mellors, Vice ...

The M6A4 Infantry Automatic Rifle, fires from a closed bolt on semi-automatic, and from open bolt during full auto, cooling the chamber and barrel. After switching to full auto, the M6A4 rifle will fire the first round from a closed bolt, ensuring maximum accuracy.