Firearm with shotgun receiver and stabilizing brace adaptor

A firearm, comprising:

• a shotgun receiver assembly;
• a box-style shotgun shell magazine that is removably secured to the receiver assembly;
• a shotgun barrel that is in communication with the receiver assembly;
• a tubular magazine that is in communication with the receiver assembly;
• a pump handle that is in communication with the tubular magazine;
• a trigger assembly that is in communication with the receiver assembly;
• a hand grip that is in communication with the receiver assembly;
• and
• a stabilizing brace adaptor that is in communication with the hand grip, said adaptor functioning to receive a stabilizing brace,
• wherein the shotgun receiver assembly comprises:
• an elongated receiver body having a front end, a back end, a top surface, a bottom surface, and a pair of opposing side surfaces defining an interior space, each of the opposing side surfaces including an elongated channel disposed along an inside portion thereof, and arranged in a generally parallel orientation to each other;
• a magazine opening disposed along the bottom side of the receiver body at a location adjacent to the front end of the receiver body, said magazine opening being in communication with the box-style shotgun shell magazine;
• a bolt having a font end, a rear end, a top surface, a bottom surface and a pair of side walls defining a firing pin chamber;
• a firing pin disposed within the chamber;
• a lock stop opening extending from the top surface of the bolt to the bottom surface of the bolt;
• an extractor arm recess located along each side wall of the bolt and adjacent to the front wall;
• and
• a spring groove disposed along one of the side walls of the bolt.