You will have to call Colt
Are you sure you have an M16A1 and not an AR15A1? If it is in fact a M16A1 the sn would be mid to late 70's
Type your answer here... 1985
No such model exists.
The M16A1 is fully automatic.
You can get the M16A1 in the "El Capitan" Tier in CUBA by completing the 'Transport A Shipment of US Arms' job.
550 meters
The M16A1 is the U.S. military designation for the AR-15 rifle built by Colt. The AR-15 itself was invented in 1957 by Eugene Stoner (1922-1997) while at ArmaLite.
The M16A1 assault rifle has two modes of fire: semi-automatic and fully automatic. As long as the trigger is held down, the weapon will continue to fire until the magazine is empty.
The M16A1 is no longer used by any branches or special operation forces in the US Military. The M16A3, however, is used by some units in the US Air Force, particularly security forces. It is not the standard-issue rifle for any branch or special forces.
To obtain the M16A1 (GL) design specs in Metal Gear Solid: Peace Walker, you must complete Extra Ops 025, which is located in Selva de la Leche: Jungle.
barrel, reciever, stock, bolt, gas tube,
Being an assault rifle, the M16A1 has two modes of select fire. It can either be fired in semi-automatic, or fully automatic. The M16A3 shares the same trigger group, while the M16A2 and M16A4 have semi-automatic and three-round burst modes.