QBU-10

It can be use for attack tank, drone, helicopter. 

Caliber
12.7x108
Action
Semi-automatic, gas operated
Overall length
1380 mm / 54.3"
Barrel length
780 mm / 30.7”
Weight, with empty magazine and w/o optical sight
13.3 kg / 29.3 lbs
Magazine capacity
5 rounds