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http://en.wikipedia.org/wiki/M27_Inf...utomatic_Rifle
In 1985, the U.S. Marine Corps adopted the M249 Squad Automatic Weapon, one year after the U.S. Army. Procurement was a service-level decision because the weapon was adopted by the Army with a contract method the Marines could use. While the belt-fed M249 was portable and had a high volume of fire, it was heavy for its role. Gunners could not keep pace with riflemen and the cumbersome light machine gun was not suited for Military Operations on Urban Terrain.
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The notion that the M27 represents a reduction in suppressive fire has spawned considerable debate among proponents of the M249 SAW within the infantry, and those who advocate that a lighter, more maneuverable, and accurate weapon is sufficient to support offensive operations at the squad level. It is debatable, in fact, that program officials actually concede a loss of suppressive fire capabilities, as the only statements of concern over this concept were made by General Conway.
Beyond the increased accuracy another proposed benefit of the M27 over the M249 are that it is in many respects a modified M4 rifle as used by the rest of the squad. This makes it far more suitable for operating indoors and in other cramped situations where its reduced size and weight make it faster and easier to handle. Although not ideal for close quarters fighting, it is far better in this function than the M249.
With a SAW, the doctrine of fire suppression was the sound of continuous fire with rounds landing close to the enemy. While the M249's volume of fire may be greater, it is less accurate. Experienced troops who have dealt with incoming fire are less likely to take cover from incoming rounds if they are not close enough. With an IAR, the doctrine is less volume of fire is needed with better accuracy. Fewer rounds need to be used and automatic riflemen can remain in combat longer and in more situations.
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, which was a significant difference when on 5-hour long missions. Gunners said it was "two weapons in one," being able to fire single shots accurately out to 800 meters and have full automatic fire. It also blended in with standard M16-style service rifles, so the enemy did not know who was a machine gunner. The battalion leadership also saw the M27 as better at preventing collateral damage, as it is more controllable on automatic than the M249. Concern of volume of fire loss was made up for through training courses developed in December 2010. With the M249 SAW, the idea of suppression was volume of fire and the sound of the machine gun. With the M27 IAR, the idea of suppression shifts to engaging with precision fire, as it has rifle accuracy at long range and automatic fire at short range. Shooters transitioned from long-range precision fire at 700 meters to short-to-medium suppressive fire at 200 meters, both while in the prone position. Some gunners in combat have been used as designated marksmen. An M27 gunner with one aimed shot has the effect of three or four automatic shots from the SAW, and still has the option of a heavier volume with an accurate grouping.[18]
Marines issued with the M27 enjoy its familiarity with the M4-style weapons in service. It is friendlier to troops 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. With a shrinking budget, the Marine Corps is looking at ways to implement the IAR as a multipurpose weapon. Suggestions include use as an automatic rifle and as a designated marksman rifle.[
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The IAR will be distributed one per four-man fireteam, three per squad, 28 per company, 84 per infantry battalion, and 72 per Light Armored Reconnaissance Battalion,[21] with 4,476 total for the Marine Corps. Nine M249s will still be available per company in reserve.
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