M16A1

The M16 (more formally Rifle, Caliber 5.56 mm, M16) is the U.S. military designation for the ArmaLite AR-15 rifle. Colt purchased the rights to the AR-15 and currently uses that designation only for semi-automatic versions of the rifle.

The M161A1 appears in Metal GEar Solid Portable Ops and Metal Gear Solid Peace Walker.