Apparatus for firing projectiles at targets and for illuminating such targets combine a projectile-firing weapon and a target illuminator. A track-and-slide combination includes a slide on the target illuminator and a track on the weapon for that slide, and a releasable slide-in-track stop in such track-and-slide combination. In the case of a firearm that has a trigger actuated by a bent trigger finger of a shooter for the firing thereof, a push-button or transverse slide switch for the target illuminator may be mounted within reach of a pad of such trigger finger prior to actuation of the trigger. For example, the shooter may draw the firearm with his or her trigger finger then outstretched for actuation of the target illuminator switch, and may then bend such trigger finger for firing of the weapon by actuation of the trigger. Such and other appliances may have a battery compartment, and a contact plate interconnecting batteries in such compartment. A contact plate retainer may be coupled to that contact plate, and a contact plate retainer receptacle may be provided therefor in the battery compartment.