This is an example of a very desirable original Colt Firearms Division commercially manufactured fully automatic M16 rifle from the 9 million serial number range. Adjustable pin front and two-leaf windage adjustable rear sights, with a non-factory replacement PGRS1 muzzle brake on the "C MP CHROME BORE" marked barrel, bayonet lug, triangular handguard, low-profile casing deflector and oval forward assist on the upper receiver. The lower receiver has a "fenced" magazine catch and a three position right handed "SAFE"/"SEMI"/"AUTO" selector. The full auto bolt carrier is "C" marked with proper serrations and an "MPC" marked bolt head, and a one piece buffer is installed. Fitted with a checkered pistol grip and a fixed buttstock with "16" marked on the left side of the buttplate, possibly an inventory/rack number.