# US 11,441,859 B2 · Hybrid ambidextrous receiver > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 11,441,859 B2 - Document ID: US11441859B2 - Status: Granted - Kind: B2 - Application number: 16/950,562 - Filed: 2020-11-17 - Published: 2021-09-02 - Granted: 2022-09-13 - Earliest claimed: 2019-11-17 - Applicants: James Matthew Underwood; Larry Cullen Underwood - Inventors: James Matthew Underwood; Larry Cullen Underwood - Web page: https://patentgrep.com/patent/US11441859B2 ## CPC - F41A 3/66: Breech housings or frames; Receivers - F41A 17/36: locking the gun {automatically} in a safety condition when the magazine is empty or removed {(F41A17/44 takes precedence)} - F41A 17/38: {Magazine mountings, e.g. for} locking the magazine in the gun - F41A 17/46: Trigger safeties, i.e. means for preventing trigger movement (F41A17/02 - F41A17/40 take precedence) - F41A 35/06: Adaptation of guns to both right and left hand use - F41A: FUNCTIONAL FEATURES OR DETAILS COMMON TO BOTH SMALLARMS AND ORDNANCE, e.g. CANNONS; MOUNTINGS FOR SMALLARMS OR ORDNANCE ## Abstract A firearm receiver assembly includes a receiver body, a threaded mount at a rear portion of the receiver body, a magazine release assembly including a magazine release portion on at least one side of the receiver body, a bolt release assembly including a bolt release central portion and a bolt release portion on at least one side of the receiver body, and a safety selector assembly including a safety portion on at least one side of the receiver body. The bolt release central portion translates vertically within a cavity of the receiver body. ## Claims ### Claim 1 A firearm receiver assembly comprising: a receiver body; a threaded mount at a rear portion of the receiver body; a magazine release assembly comprising a magazine release portion on at least one side of the receiver body; a bolt release assembly comprising a bolt release central portion, a first bolt release portion on a left side of the receiver body, and a second bolt release portion on a right side of the receiver body; and a safety selector assembly comprising a safety portion on at least one side of the receiver body, wherein the bolt release central portion translates in a single direction without rotating within a cavity of the receiver body. ### Claim 2 (depends on 1) The firearm receiver assembly of claim 1, wherein the receiver body comprises a polymer material. ### Claim 3 (depends on 1) The firearm receiver assembly of claim 1, wherein: the threaded mount is a separate component from the receiver body; the receiver body comprises a polymer material; and the threaded mount comprises a metallic material. ### Claim 4 (depends on 1) The firearm receiver assembly of claim 1, wherein: the magazine release portion comprises a first magazine release portion on a left side of the receiver body and a second magazine release portion on a right side of the receiver body; an operator interface portion of the first magazine release portion and an operator interface portion of the second magazine release portion are symmetric relative to one another; the first magazine release portion comprises a pivoting lever; and the second magazine release portion comprises a pivoting lever. ### Claim 5 (depends on 4) The firearm receiver assembly of claim 4, wherein at least one selected from the group of the first magazine release portion and the second magazine release portion comprises a pin defining a rotational axis. ### Claim 6 (depends on 5) The firearm receiver assembly of claim 5, wherein the pin comprises a set screw with threads. ### Claim 7 (depends on 1) The firearm receiver assembly of claim 1, wherein the bolt release central portion is a separate component from the first bolt release portion and the second bolt release portion. ### Claim 8 (depends on 1) The firearm receiver assembly of claim 1, wherein: the first bolt release portion comprises a pivoting lever and at least one operator interface portion; the second bolt release portion comprises a pivoting lever and at least one operator interface portion; and the at least one operator interface portion of the first bolt release portion and the at least one operator interface portion of the second bolt release portion are symmetric relative to one another. ### Claim 9 (depends on 1) The firearm receiver assembly of claim 1, wherein: the magazine release portion comprises a first magazine release portion on a left side of the receiver body and a second magazine release portion on a right side of the receiver body; the bolt release portion comprises a first bolt release portion on a left side of the receiver body and a second bolt release portion on a right side of the receiver body; and the safety portion comprises a first safety portion on a left side of the receiver body and a second safety portion on a right side of the receiver body. ### Claim 10 A receiver assembly for a firearm comprising: a receiver body comprising a left side and a right side; a threaded mount at a rear portion of the receiver body; a magazine release assembly comprising a first magazine release portion on the left side of the receiver body and a second magazine release portion on the right side of the receiver body; and a bolt release assembly comprising a bolt release portion on at least one side of the receiver body, wherein: the first magazine release portion comprising a pivoting lever that rotates about a first pin; the second magazine release portion comprising a pivoting lever that rotates about a second pin; and the first magazine release portion and the second magazine release portion contact one another approximately halfway between the first pin and the second pin. ### Claim 11 (depends on 10) The receiver assembly of claim 10, wherein the receiver body comprises a polymer material. ### Claim 12 (depends on 10) The receiver assembly of claim 10, wherein: the threaded mount is a separate component from the receiver body; the receiver body comprises a polymer material; and the threaded mount comprises a metallic material. ### Claim 13 (depends on 12) The receiver assembly of claim 12, wherein the threaded mount comprises a plurality of retaining features that engage a material of the receiver body. ### Claim 14 (depends on 10) The receiver assembly of claim 10, wherein: the bolt release assembly comprises a bolt release central portion; and the bolt release central portion translates vertically within a cavity of the receiver body. ### Claim 15 (depends on 10) The receiver assembly of claim 10, wherein an operator interface portion of the first magazine release portion and an operator interface portion of the second magazine release portion are symmetric relative to one another. ### Claim 16 (depends on 10) The receiver assembly of claim 10, wherein the bolt release portion comprises a first bolt release portion on a left side of the receiver body and a second bolt release portion on a right side of the receiver body. ### Claim 17 (depends on 16) The receiver assembly of claim 16, wherein: the first bolt release portion comprises at least one operator interface portion; and the second bolt release portion comprises at least one operator interface portion. ### Claim 18 (depends on 17) The receiver assembly of claim 17, wherein the at least one operator interface portion of the first bolt release portion and the at least one operator interface portion of the second bolt release portion are symmetric relative to one another. ### Claim 19 (depends on 10) The receiver assembly of claim 10, wherein at least one selected from the group of the first magazine release portion and the second magazine release portion comprises a recess on an interior side. ### Claim 20 (depends on 10) The receiver assembly of claim 10, wherein at least one selected from the group of the first pin and the second pin comprises a set screw with threads. ### Claim 21 (depends on 1) The firearm receiver assembly of claim 1, wherein the first bolt release portion interfaces with a forward side of the bolt release central portion and the second bolt release portion interfaces with a rear side of the bolt release central portion. ### Claim 22 (depends on 1) The firearm receiver assembly of claim 1, wherein at least one selected from the group of the first bolt release portion, the second bolt release portion, and the magazine release portion comprise a removable external interfacing component that is separate from the internal mechanism for operation.