11th MEU. Is this rifle standard issue or Recon specific?

PACIFIC OCEAN (June 9, 2012) Sgt. Brenden Grace, assigned to the 11th Marine Expeditionary Unit (11th MEU), demonstrates to Lt. j.g. Stephen Logan how to properly handle an M4 rifle on the aircraft elevator of the amphibious assault ship USS Makin Island (LHD 8) during weapons familiarization training. Makin Island and embarked Marines assigned to the 11th MEU are deployed to the U.S. 7th Fleet Area of operations. (U.S. Navy photo by Mass Communication Specialist 2nd Class Dominique Pineiro/Released)

The caption isn't specific but is the good Sgt with the Raid Force or line units?  If he's with Raid, read that to mean Recon which wouldn't make the rifle and its accessories unique.  If he's in one of the line units then wow.  Silencers have been talked about but to my knowledge, no one has acted on it for conventionals...new holsters yes, Vickers slings yes, nsn numbers for unit purchases of automatic or custom knives yes...but for this potentially revolutionary tool for conventional units...no.

On a sidenote I am still amazed that the US Army and Marine Corps are calling a carbine a rifle and complaining because they're not getting the performance of a rifle in that smaller package.  Additionally with all the stuff being put on these carbines they're now as heavy as a full size rifle.  You add a can to them and you have the length of a rifle too.  Like I said.  Amazing.