Weapon systems in the nature of firearms; weapon attachments in the nature of modular external rail systems for firearms, modular external rail systems for attaching accessories to firearms, mounts for attaching accessories to a firearm, mounts for attaching ancillary equipment to a firearm, mounts for attaching grips to a firearm, mounts for attaching gun sights to a firearm, mounts for attaching pointing devices to a firearm, mounts for attaching lighting to a firearm, mounts for attaching night vision devices to a firearm, mounts for attaching sights to a firearm; weapons accessories in the nature of modular external rail systems for attaching accessories to firearms, mounts for attaching accessories to a firearm, mounts for attaching ancillary equipment to a firearm, mounts for attaching grips to a firearm, mounts for attaching gun sights to a firearm, mounts for attaching pointing devices to a firearm, mounts for attaching lighting to a firearm, mounts for attaching night vision devices to a firearm, mounts for attaching sights to a firearm; rails for weapons in the nature of modular external rails systems for attaching accessories to firearms, rail systems for weapons in the nature of modular external rails systems for attaching accessories to firearms; systems for attaching accessories to weapons in the nature of modular external rails systems for attaching accessories to firearms; handles for weapons in the nature of grips for firearms, adaption kits for weapons comprising modular external rails systems for attaching accessories to firearms, magazines for weapons, magazine counters for weapons in the nature of firearm magazine accessories that tabulate and display the quantity of ammunition in the magazine