DShK

The DShK is a Soviet-made heavy machine gun, comparable to the American M2. It is often referred to as the "Dushka".

Call of Duty: Black Ops
The DShK is frequently seen in "Vorkuta," mounted on the back of trucks manned by prison guards. After jumping from his motorcycle to one of these trucks, Mason uses a DShK to fire at enemy motorcycles, trucks, and Mi-8 helicopters. During "WMD," Hudson and his team use a similar truck, with Hudson using the mounted DShK to provide cover while the truck is started.

Trivia

 * The sights on this weapon are unique compared to other mounted machine guns featured in the Call of Duty series; it appears to actually have a chain inside its sights (it is the completely horizontal axis as shown in the picture above). The first hole in the chain to the right (next to the two soild axes) is where the bullets will land.
 * It also appears to have a second, but unusable, sight on the left side of the gun (unlike other mounted machine guns), which seems to use three wires running horizontally through its centre, spaced close to each other. How it would aim if it was used is unknown.
 * The sights are AA (Anti Air) sights. The horizontal "chain" is there to assist in shooting down moving targets.
 * This is the first time feature a Soviet Heavy Machine Gun that was useable by the player.