When preparing to fire at a target 1,200 meters away, what rear sight position should the M240 be in?

For engaging a target at a distance of 1,200 meters with the M240, the rear sight should be set to a vertical position with the peep sight. This positioning allows for greater precision at long ranges by providing a smaller sight picture that can enhance aiming accuracy. The peep sight design is conducive to improved focus on distant targets, making it easier for the shooter to align the front sight with the target while minimizing distractions.

Setting the rear sight to vertical also helps to compensate for bullet drop at extended ranges, which is critical when firing over such distances. At 1,200 meters, trajectory adjustments become increasingly important; thus, having the right sight configuration is essential for achieving effective range elevation and ensuring successful hits on the target.