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Extremely simple BDCC + other stuff (READ DESCRIPTION)

The simplest a ballistic drop compensator can be
H will lase the center of the cameras view and update the BDC computer, lifting up the barrel to adjust for the distance
L will enable two lasers, one on the optic and the other on the gun

Optimised for an AP tank cannon with 4 barrels, any other ammo type or gun will misalign at long ranges