What are the two types of sights on the M203?

The correct response highlights the types of sights specifically designed for the M203 grenade launcher, which are indeed leaf and quadrant sights. These sights are manual and mechanical, allowing the operator to determine range and angle to effectively target and launch grenades.

Leaf sights consist of a simple folding design and are typically calibrated for various distances, while quadrant sights provide a more graduated approach for aiming over longer ranges. Both types allow soldiers to use the M203 effectively in different combat scenarios by facilitating accurate targeting.

Other options, while they reference different types of sights that might be associated with other weapons, do not specifically apply to the M203. For example, red dot sights and ACOG (Advanced Combat Optical Gunsight) are used on various rifles but not directly associated with the M203. Similarly, iron sights and reflex sights are common in many firearms yet are not the primary sighting instruments for the M203.