a receiver having a fore end portion;

a barrel pivotally attached to the fore end portion, the barrel having a muzzle end, a breech end, and a centerline extending therebetween;

a trigger assembly coupled to the receiver adjacent the breech end of the barrel;

a hand grip attached to the receiver adjacent the trigger assembly;

a buttstock assembly coupled to the receiver; and

a fire control system secured to the fore end portion of the receiver, the fire control system comprising:

a first cradle arm and a second cradle arm opposing the first cradle arm, the first and second cradle arms attached to the fore end of the receiver on opposite transverse sides of the centerline;

a main body comprising at least one sight for aiming the grenade launcher apparatus, the main body manually rotatably supported between the first and second cradle arms, the main body pivotable about a pivot axis which extends perpendicular to the centerline;

a processor assembly including a processor and an associated computer readable memory encoded with executable instructions, the processor configured, upon execution of the executable instructions, to determine a trajectory angle corresponding to a rotational position of the main body in relation to the centerline and to calculate a distance that a projectile fired by the grenade launcher apparatus will travel;

a display configured to output said distance in human viewable form, said distance configured to change responsive to manual rotation of the main body;

the at least one sight configured to assist the user in aligning the grenade launcher apparatus with the trajectory angle by causing the grenade launcher apparatus to be aligned with the trajectory angle when an optical axis of the at least one sight is aligned with a target located at the calculated distance.