Harrington & Richardson (H&R) Model 158 Single Shot Shotgun

This item is the receiver and frame assembly of a Harrington & Richardson, Inc. single-shot shotgun, manufactured in Gardner, Massachusetts. The firearm features a case-hardened steel finish that exhibits a significant amount of mottling, surface oxidation, and a dark brown patina indicative of heavy use and age. Visible markings stamped into the left side of the receiver include 'HARRINGTON & RICHARDSON, INC.', 'GARDNER, MASS. MADE IN U.S.A.', along with 'U.S. PATENT NO. 3988848' and serial number 'BA559528'. The patent number refers to a specific firing pin assembly and safety mechanism utilized in mid-20th-century H&R break-action designs. Structurally, the receiver shows signs of wear, particularly around the pin locations and the edges of the metal frame. The trigger guard is finished in a standard black coat which also shows light scratching. There are clear signs of surface corrosion and some pitting, particularly toward the top of the receiver near the barrel junction. Based on the manufacturer's location and the serial number prefix, this piece likely dates from the 1970s. The craftsmanship is typical of utilitarian American-made sporting arms of the period, designed for durability and functionality rather than aesthetic refinement.

I have examined the images and descriptions of the Harrington & Richardson (H&R) Model 158 receiver, serial number BA559528. Based on the 'BA' prefix, this frame was manufactured in 1977. The unit is a standard utility-grade break-action receiver featuring the transfer bar safety system protected by U.S. Patent 3988848. My visual assessment confirms significant surface oxidation, mottling, and pitting consistent with a firearm that has seen heavy field use and likely improper storage. The case-hardened finish has largely transitioned to a dark brown patina. Market demand for H&R Model 158 components is stable but low-value, primarily driven by hobbyists looking for 'donor' frames for custom barrel projects or repairs. Because this is only the receiver/frame and lacks the barrel and furniture (stock/forend), its value is significantly reduced compared to a complete firearm. Complete Model 158 shotguns in good condition typically sell for $150–$225; as a stripped or barreless receiver in 'fair' to 'poor' cosmetic condition, the value is relegated to the lower tier of the secondary market. Limitations of this appraisal include the inability to physically test the mechanical integrity of the firing pin, spring tension, or sear engagement. While the markings appear authentic to the Gardner, Mass. factory, a full authentication would require an in-person headspace check and a metallurgical inspection to ensure the pitting has not compromised the frame's structural integrity. This appraisal assumes the internal lockwork is complete and functional. Use of this frame for a functional build should only occur after a physical inspection by a qualified gunsmith.