# US 11,029,125 B2 · Break open system having an adjustable, releasable forend stock > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 11,029,125 B2 - Document ID: US11029125B2 - Status: Granted - Kind: B2 - Application number: 16/864,266 - Filed: 2020-05-01 - Published: 2020-08-27 - Granted: 2021-06-08 - Earliest claimed: 2017-12-28 - Assignees: Ardesa, S.A. - Applicants: Ardesa, S.A. - Inventors: Angel Calvete - Web page: https://patentgrep.com/patent/US11029125B2 ## CPC - F41C 23/16: Forestocks; Handgrips; Hand guards (pump-action guns F41C7/02) - F41A 3/58: Breakdown breech mechanisms, e.g. for shotguns - F41C: SMALLARMS, e.g. PISTOLS, RIFLES (functional features or details common to both smallarms and ordnance, mountings therefor F41A; projecting missiles without use of explosive or combustible propellant charge F41B); ACCESSORIES THEREFOR - F41A: FUNCTIONAL FEATURES OR DETAILS COMMON TO BOTH SMALLARMS AND ORDNANCE, e.g. CANNONS; MOUNTINGS FOR SMALLARMS OR ORDNANCE ## Abstract A forend stock for a break open firearm having a housing lug, the housing lug being attached into the lower side of the barrel assembly. A coupler is secured onto the housing lug. At the coupler end opposite the housing lug rod, there is a cylindrical area, and between the two coupler ends, another finished area forming an extended flange. The extended flange has a larger diameter than the cylindrical ends of the coupler. A latch bolt is secured to the forend stock by a cover plate. The latch bolt is topped at one of its ends with a sharp bevel. At its other end, it has a cylindrical post to support a pressure spring, and is held in a longitudinal channel or recess, and arranged such that a user can access an actuator knob for manual handling of the latch bolt. The cover plate assembly has an aperture which the ledges of an extended protrusion of the latch bolt fit within, defining the forward and backward travel limits that the bolt can go in a direction parallel to the axial direction of the barrel. ## Claims ### Claim 1 A firearm having an adjustable, releasable forend stock comprising: a barrel assembly; a retainer mechanism including a housing lug, said housing lug being threadably attached on a first side to a lower side of said barrel assembly, said housing lug having a threaded rod projecting on a second side opposite said first side, towards said forend stock; a coupler threadably secured onto said housing lug threaded rod at a first end and having at a second end opposite said first end formed for insertion within a bushing fixed on said forend stock, said coupler including a cylindrical portion intermediate said coupler first and second ends, said cylindrical portion having an extended flange; and a latch bolt having a top surface and a beveled end, said latch bolt in slidable communication with said forend stock, and acted upon by a resilient component, such that said latch bolt secures said forend stock to said barrel assembly when in a locked position said latch bolt prohibits said coupler extended flange from movement. ### Claim 2 (depends on 1) The firearm of claim 1 wherein said housing lug includes a curved top surface for mating attachment to said barrel assembly. ### Claim 3 (depends on 1) The firearm of claim 1 including: a cover plate secured to said forend stock, said cover plate having an aperture; said latch bolt having a projection extending above said latch bolt top surface, and into said cover plate aperture, such that said cover plate aperture restricts slidable movement of said latch bolt. ### Claim 4 (depends on 1) The firearm of claim 1, wherein said cylindrical portion of said coupler includes a transition radius that decreases with axial length as said cylindrical portion extends towards said forend stock. ### Claim 5 (depends on 1) The firearm of claim 1, wherein said resilient component is at least partially contained by said latch bolt. ### Claim 6 (depends on 5) The firearm of claim 5, wherein said resilient component is a spring. ### Claim 7 (depends on 1) The firearm of claim 1, including an actuator knob connected at one end to said latch bolt, and extending at an opposite end from said forend stock underside, said actuator knob having a lower portion for promoting sliding action by a user. ### Claim 8 (depends on 7) The firearm of claim 7, wherein said actuator knob is attached to said latch bolt, such that upon sliding of said actuator knob towards said firearm breech end, said latch bolt is moved in a same direction, releasing said forend stock from said barrel assembly. ### Claim 9 (depends on 1) The firearm of claim 1, wherein said bushing includes a hollow end for receiving said coupler. ### Claim 10 (depends on 9) The firearm of claim 9, wherein said coupler includes a set screw for extending said coupler length and locking said coupler in place with respect to said housing lug. ### Claim 11 (depends on 10) The firearm of claim 10, wherein said set screw is receivable within said bushing hollow end. ### Claim 12 (depends on 1) The firearm of claim 1 wherein said latch bolt includes a back end shaped as a rod to serve as a guide to a compression spring that propels the latch bolt in a forward, muzzle end direction. ### Claim 13 (depends on 1) The firearm of claim 1 wherein said forend stock includes at a breech end a concave radial surface such that upon attachment with a complementary portion of a receiver end forms a rotational connection.