The M21 DMR is Cassified a 7.62mm Sniper Rifle. The M21 Has 2 fire Modes Safty and Semi-autimatic fire modes. It can use a silencer at the end of the barrel thus improving the accuracy of firing multiple shots in a row.
M14 to M21/25Edit
The M21 is simply a modified M14 with the Fully Autimatic fire mode removed to make the weapon a simple DMR. The M14 itself has an accuracy range of 900 yards making the M21 a proven design having seen combat in Vietnam. The M21 is the holder of the most confirmed kills with 7.62x51mm Sniper Rifle.