A digital machinegun optic (DMO) is discussed, which includes a digital module having a camera to obtain an image, a bullet drop compensation mount receiving the digital module in a detachable manner, and having a mounting solution, a caliber adjustment knob configured to enable a user to select a caliber that matches firearms of different calibers, and a dual bullet drop compensation wheel to allow the user to accurately hit a target by selecting a right distance to the target; a head mounted display module having a display portion to receive the image from the camera; and a control box module configured to control a display of the image on the display portion.