Marine Corps Times has an interesting article on the IAR competition. It seems the Army is not interested in a lightweight automatic rifle.

That’s why the Army, which also uses the M249, has ruled out a soldier version of the Marine IAR.

“We are not considering adopting an auto rifle for the infantry squad,” said Col. Robert Radcliffe, director of the Infantry Center’s Directorate of Combat Developments at Fort Benning, Ga.

…

The plan is to buy 4,100 IARs and reduce the number of SAWs in the Corps from 10,000 to 8,000, Cantwell said.

“We are still going to maintain SAWs in the company,” he said. “Only 2,000 SAWs will be replaced. The reminder will be kept as an organizational weapon for when commanders need them.”