Unitary breechblock assembly

Abstract

A single-shot break action firearm includes a receiver, a barrel, and a stock. The receiver has a breach portion that defines a cavity that is sized and shaped to house a breechblock therein. The breechblock is constructed from a powdered metal formed by metal-injection-molding. The breechblock is form from a higher strength material than the receiver to contain explosive forces produced during discharge of the firearm. The barrel is connected with the receiver and extends forward therefrom. The stock is connected with the receiver and extends rearward therefrom.

1 . A single-shot break action firearm comprising:
 a receiver having a breech portion, the breech portion defining a cavity being sized and shaped to house a breechblock therein, the breechblock being constructed from a powdered metal formed by metal-injection-molding, the breechblock being constructed of a higher strength material than the receiver to contain explosive forces produced during discharge of the firearm;   a barrel connected with the receiver and extending forward therefrom; and   a stock connected with the receiver and extending rearward therefrom.   
     
     
         2 . The single-shot break action firearm according to  claim 1 , further comprising at least one moveable component housed within the receiver and constructed from a powdered metal formed by metal-injection-molding, the at least one movable component being selected from the group consisting of a hammer, a trigger, a firing pin, a barrel catch, and an extractor. 
     
     
         3 . The single-shot break action firearm according to  claim 1 , further comprising a sight mount constructed from a powdered metal formed by metal-injection-molding, the sight mount being attached to the top of the barrel by screws that extend into the barrel. 
     
     
         4 . The single-shot break action firearm according to  claim 1 , wherein the breech block is pivotally connected with a barrel catch to form a slide-in unitary breech block and barrel catch assembly, the receiver being formed by die cast, the receiver being sized and shaped to receive the slide-in unitary breech block and barrel catch assembly. 
     
     
         5 . The single-shot break action firearm according to  claim 1 , wherein the receiver houses a firing mechanism, the firing mechanism including a firing pin and firing pin spring clamped between the receiver and the breech block. 
     
     
         6 . The single-shot break action firearm according to  claim 1 , wherein the barrel is connected to the receiver by a barrel tang that is bolted to the barrel and is pivotable with respect to the receiver and stationary with respect to the barrel. 
     
     
         7 . The single-shot break action firearm according to  claim 6 , wherein a pivot pin connects the barrel tang with the receiver by extending through transverse holes in both the receiver and the barrel tang, the barrel being void of a direct connection to the receiver. 
     
     
         8 . The single-shot break action firearm according to  claim 6 , wherein the upper interior surfaces of the die cast receiver being machined to provide interference flats that complement flats formed on a barrel tang to enhance engagement of the barrel catch with the barrel tang. 
     
     
         9 . The single-shot break action firearm according to  claim 1 , the receiver being constructed from a material selected from the group consisting of being formed from a base metal that is die cast, being formed of a thermoset plastic, and being formed of a fiber-resin composite. 
     
     
         10 . The single-shot break action firearm according to  claim 1 , wherein the powdered metal used to construct the breechblock being a steel powder. 
     
     
         11 . The single-shot break action firearm according to  claim 1 , the breech block being connected with the receiver with a breech bolt extending from the breech portion of the receiver into the breech bock. 
     
     
         12 . The single-shot break action firearm according to  claim 1 , wherein the breech block pivotally supporting a barrel catch for retaining the barrel in a closed position, the barrel catch being void of any pivotal connections to the receiver. 
     
     
         13 . A receiver defining a cavity being sized and shaped to house a breechblock therein, the breechblock being constructed from a powdered metal formed by metal-injection-molding, the breechblock being constructed of a higher strength material than the receiver to contain explosive forces produced during discharge of the firearm.