A multi-accessory mount assembly for use with a firearm, and methods for coupling the assembly to the firearm are provided. The assembly may include a proximal portion having a lower surface configured to be removably coupled to the firearm and an upper surface configured to be removably coupled to a sub mount. The sub mount may be configured to be removably coupled to a first firearm accessory, e.g., an optic scope, a red dot sight, a reflex sight, a night vision monocular or scope, or a magnifier. The assembly further may include a distal portion extending distally from the proximal portion via a neck portion, such that the distal portion is elevated higher than the proximal portion. An upper surface of the distal portion may be configured to be removably coupled to a second firearm accessory, e.g., an infrared laser or a night vision monocular or scope.

A sight mount system for preserving adjustment settings of a removable aiming sight so as to avoid disturbing the point of aim of the aiming sight when the aiming sight is removed and subsequently reinstalled on a projectile weapon. The system includes an aiming sight foot supporting the aiming sight and a sight mount shoe for receiving the aiming sight foot. The sight mount shoe includes a non-adjustable datum surface, and pitch and yaw adjustment mechanisms that cooperate with the datum surface to establish the pitch and yaw of the aiming sight when the aiming sight foot is secured in the sight mount shoe. A foot retainer urges the aiming sight foot into contact with the datum surface and the pitch and yaw adjustment mechanisms, the foot retainer being manually operable to enable removal and reinstallation of the aiming sight foot without disturbing the pitch and yaw adjustment mechanisms.

A quick-attachment/quick-release firearm accessory mounting assembly releasably and rotatably attached to a firearm rail, chassis, or handgun slide to receive any of a number of different accessories, such as, a telescopic sight, reflector sight, laser sight, night vision sight, thermal scope, range finder, and other secondary instruments. The mounting assembly is in the form of an adaptor plate having attachment structures for receiving the accessory on a top surface, and securing to the firearm structure on a bottom surface. The firearm is modified to receive the adaptor plate, the firearm frame having a recess portion with a center protrusion in rotatable communication with a center aperture in the adaptor plate, and having grooves or slots formed at each end of the recess portion to receive flanges at each end of the adaptor plate upon rotation.