# US 11,994,355 B1 · Firearm cam pin and methods of use thereof > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 11,994,355 B1 - Document ID: US11994355B1 - Status: Granted - Kind: B1 - Application number: 17/400,058 - Filed: 2021-08-11 - Granted: 2024-05-28 - Earliest claimed: 2015-08-26 - Applicants: Edward Sugg - Inventors: Edward Sugg - Web page: https://patentgrep.com/patent/US11994355B1 ## CPC - F41A 3/26: semi-automatically or automatically operated, e.g. having a slidable bolt-carrier and a rotatable bolt - F41A 3/66: Breech housings or frames; Receivers - F41A 5/26: Arrangements or systems for bleeding the gas from the barrel (F41A5/20 - F41A5/24 take precedence) - F41A: FUNCTIONAL FEATURES OR DETAILS COMMON TO BOTH SMALLARMS AND ORDNANCE, e.g. CANNONS; MOUNTINGS FOR SMALLARMS OR ORDNANCE ## Abstract A cam pin configured to be moveably constrained within a cam slot of a firearm bolt carrier and configured to be operatively connected to a firearm bolt, the cam pin having a cam pin shaft with a firing pin opening. The cam pin head of the cam pin is configured to contact the upper receiver via a cam pin head contact surface that has a reduced contact surface area or length. ## Claims ### Claim 1 A cam pin configured to be moveably constrained within a cam slot of a firearm bolt carrier and configured to be operatively connected to a firearm bolt, wherein the cam pin comprises: a cam pin shaft comprising a firing pin opening with a firing pin opening central axis and configured to receive a firing pin therethrough substantially along the firing pin opening central axis; and a cam pin head at an end of the cam pin shaft configured to slide within an upper receiver slot and contact the upper receiver via a cam pin head contact surface, wherein cam pin head contact surface includes at least a curved surface portion with a major axis that is perpendicular to the firing pin opening central axis. ### Claim 2 (depends on 1) The cam pin of claim 1, wherein the cam pin head has a width, wherein the contact surface spans the width of the cam pin head, wherein the cam pin contact surface forms a convexly curved surface spanning the width of the cam pin head. ### Claim 3 (depends on 1) The cam pin of claim 1, wherein the cam pin head has a height, wherein the contact surface spans the height of the cam pin head, and wherein the cam pin contact surface forms a convexly curved surface that spans the height of the cam pin head. ### Claim 4 (depends on 1) The cam pin of claim 1, wherein the cam pin head has a width and a height, wherein the contact surface spans the height and width of the cam pin head, and wherein the cam pin contact surface forms a convexly curved surface that spans the height and width of the cam pin head. ### Claim 5 A cam pin configured to be moveably constrained within a cam slot of a firearm bolt carrier and configured to be operatively connected to a firearm bolt, wherein the cam pin comprises: a cam pin shaft comprising a firing pin opening configured to receive a firing pin therethrough; and a cam pin head at an end of the cam pin shaft configured to slide within an upper receiver slot and contact the upper receiver via a cam pin head contact surface, wherein the cam pin head contact surface has a curved portion that reduces a contact surface area that contacts the upper receiver, wherein the contact area is 0.00196-0.0190 inches squared. ### Claim 6 (depends on 5) The cam pin of claim 5, wherein the cam pin head contact surface has a surface area of 0.01764-0.0190 inches squared that contacts the upper receiver at a given time. ### Claim 7 (depends on 5) The cam pin of claim 5, wherein the cam pin head contact surface has a surface area of 0.0147-0.0180 inches squared that contacts the upper receiver at a given time. ### Claim 8 (depends on 5) The cam pin of claim 5, wherein the cam pin head contact surface has a surface area of 0.0098-0.0150 inches squared that contacts the upper receiver at a given time. ### Claim 9 (depends on 5) The cam pin of claim 5, wherein the cam pin head contact surface has a surface area of 0.00196-0.0100 inches squared that contacts the upper receiver at a given time. ### Claim 10 A cam pin configured to be moveably constrained within a cam slot of a firearm bolt carrier and configured to be operatively connected to a firearm bolt, wherein the cam pin comprises: a cam pin shaft comprising a firing pin opening configured to receive a firing pin therethrough; and a cam pin head at an end of the cam pin shaft configured to slide within an upper receiver slot and contact the upper receiver via a cam pin head contact surface, wherein the cam pin head contact surface has a curved portion so that a contact area length that contacts the upper receiver at a given time is reduced, wherein the contact area length that contacts the upper receiver is 0.0245″-0.2375″. ### Claim 11 (depends on 10) The cam pin of claim 10, wherein the cam pin head contact surface has a contact area length of 0.2205″-0.2375″ that contacts the upper receiver at a given time. ### Claim 12 (depends on 10) The cam pin of claim 10, wherein the cam pin head contact surface has a contact area length of 0.18375″-0.225″ that contacts the upper receiver at a given time. ### Claim 13 (depends on 10) The cam pin of claim 10, wherein the cam pin head contact surface has a contact area length of 0.1225-0.1875″ that contacts the upper receiver at a given time. ### Claim 14 (depends on 10) The cam pin of claim 10, wherein the cam pin head contact surface has a contact area length of 0.0245″-0.125″ that contacts the upper receiver at a given time. ### Claim 15 A cam pin configured to be moveably constrained within a cam slot of a firearm bolt carrier and configured to be operatively connected to a firearm bolt, wherein the cam pin comprises: a cam pin shaft comprising a firing pin opening configured to receive a firing pin therethrough; and a cam pin head at an end of the cam pin shaft configured to slide within an upper receiver slot and contact the upper receiver via a cam pin head contact surface, wherein the cam pin head contact surface has a curved portion that reduces a contact area length that contacts the upper receiver, wherein the contact area length is 0.001″-0.0245″. ### Claim 16 (depends on 1) The cam pin of claim 1, wherein the cam pin shaft and cam pin head are a unitary structure. ### Claim 17 (depends on 5) The cam pin of claim 5, wherein the firing pin opening has a central axis and is configured to receive the firing pin therethrough substantially along the central axis, wherein a major axis of the curved portion is perpendicular to the central axis. ### Claim 18 (depends on 5) The cam pin of claim 5, wherein the cam pin shaft and cam pin head are a unitary structure. ### Claim 19 (depends on 10) The cam pin of claim 10, wherein the firing pin opening has a central axis and is configured to receive the firing pin therethrough substantially along the central axis, wherein a major axis of the curved portion is perpendicular to the central axis. ### Claim 20 (depends on 15) The cam pin of claim 15, wherein the firing pin opening has a central axis and is configured to receive the firing pin therethrough substantially along the central axis, wherein a major axis of the curved portion is perpendicular to the central axis.