Is this an M27 with 2nd LAR?

AZIRABAD, Helmand Province, Afghanistan-Lance Cpl. Frank M. Garrison III, a Shinnston, W. Va., native and rifleman with Company C, 2nd Light Armored Reconnaissance Battalion, 2nd Marine Division (Forward), provides security as the Afghan Border Police partnered with the Marines and sailors of the company move through the town. Company C accompanied the ABP on a clearing mission through the town in order to deny the insurgency a transit location for smuggling illicit drugs. , Cpl. Jeff Drew, 6/27/2011 5:49 AM

Take a look at this Marine's weapon.

I'm not sure but it doesn't look quite like a M16A4....but it doesn't exactly fit the profile of the M27 either.  Anyone know what it is?