Marine Corp Times reports that Commandant Gen. Robert Neller has signed off on the switch making the M4 the primary weapon for all infantry battalions, security forces and supporting schools no later than the end of September 2016. This comes after evaluating M4 with 5.56mm AB49 Special Operations Science and Technology cartridge.
http://www.marinecorpstimes.com/story/military/2015/10/26/commandant-approves-m4-standard-rifle-marine-corps-infantry/74593750/
From: Marine Corp Times
