A Coaxial HMG is a heavy machine gun mounted coaxially to a tank's main cannon. A coaxial weapon allows engagement of exposed infantry and urban combat without the collateral damage of firing the main gun.
Most main battle tanks come with a 7.62mm GPMG built into the turret, sighted and fired by the same gunner who operates the cannon. Most examples of a large coaxial are modifications rather than part of the original design. The M1A2 Abrams "TUSK" (Tank Urban Survival Kit) can add an M2 Browning 12.7mm machine gun over the 120mm cannon.
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17700 MBT score
• Secondary weapon for tank operator
Main Battle Tank (Driver)
|Battlefield 3 Tank Guide - Coaxial HMG(05:28)|
The Coaxial HMG is a vehicle specialization in Battlefield 3. When used, the driver gets a secondary weapon for use against enemy personnel and light vehicles. Compared to the Coaxial LMG, it benefits from a much higher damage per individual bullet, at a max of 50 trailing down to 34, and a higher accuracy, at the cost of firing at a significantly slower rate of fire. Unlike the Coaxial LMG, the HMG does not overheat, allowing for continuous fire.
The HMG can engage infantry at any range, but is the single most effective long-range anti-infantry tank weapon, with the first 3 shots retaining perfect accuracy. It deals 34% damage per shot at full dropoff, so it will kill in 3 shots in normal mode and only 2 in Hardcore mode. The HMG also has the fastest bullet velocity in the game, clocking in at 750 m/s, reducing the amount of leading and bullet drop compensation needed for moving targets. In Hardcore, it can one hit kill at any range if it hits the head, or a chest shot and higher at close range.
Unlike the LMG, the HMG can damage lightly-armored vehicles, including jets and helicopters. Its high velocity, however, is offset by its low fire rate in anti-air combat, as well as the tank turret's slow and vertically-limited traversal. As the Canister Shell is more forgiving in aim and deals excellent damage, it is generally more effective against air targets within close- to medium-range.
The Coaxial HMG is larger than the LMG, so it is mounted above the main cannon rather than through the traditional gun port. It is easily seen in first-person view.
After the 1.04 Patch the fire rate of the HMG is much faster than before, while still avoiding overheating. The Armored Kill patch gave it greatly increased accuracy.