# US 2014/0190055 A1 · Interchangeable buttstock system for rifles > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2014/0190055 A1 - Document ID: US20140190055A1 - Status: Published application - Kind: A1 - Application number: 14/152,157 - Filed: 2014-01-10 - Published: 2014-07-10 - Earliest claimed: 2013-01-10 - Assignees: Sturm, Ruger & Company, Inc. - Applicants: Sturm, Ruger & Company, Inc. - Inventors: Scott Warburton - Web page: https://patentgrep.com/patent/US20140190055A1 ## CPC - F41C 23/20: Butts; Butt plates; Mountings therefor (F41C23/08, F41C23/10, {F41C23/14} take precedence) - F41A 11/00: Assembly or disassembly features; Modular concepts; Articulated or collapsible guns (F41A3/64, F41A19/10 - F41A19/15, F41A21/48, F41A25/26 take precedence) - F41C 23/14: Adjustable stock or stock parts, i.e. adaptable to personal requirements, e.g. length, pitch, cast or drop - 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 modular buttstock system for firearms includes user replaceable and interchangeable buttstock modules. The modules include a comb portion and butt portion which ma be provided in a variety of configurations, sizes, and materials. The modules and firearm buttstock each include complementary configured mourning portions and a mounting system designed to provide interchangeable and removable attachment of the modules to the buttstock. In some non-limiting embodiments, the buttstock and modules may be formed of synthetic materials. ## Claims ### Claim 1 A modular buttstock system for a firearm, the system comprising: a longitudinally-extending buttstock including a right sidewalk a left sidewalk a closed bottom connecting the right and left sidewalls, a front end, a rear end, and an internal rearwardly open cavity extending between the front and rear ends; a buttstock module removably attached to the buttstock, the module including a longitudinally-extending upper comb portion positioned above the buttstock and a rear butt portion positioned at the rear end of the buttstock; the buttstock module further including a forwardly projecting rear mounting flange inserted into the rearwardly open cavity of the buttstock; and a fastening mechanism removably securing the buttstock module to the buttstock ### Claim 2 (depends on 1) The system of claim 1, further comprising an open top formed in the buttstock. ### Claim 3 (depends on 2) The system of claim 2, wherein the buttstock module includes a laterally spaced apart pair of downwardly projecting longitudinal side mounting flanges inserted into the open top of the buttstock. ### Claim 4 (depends on 3) The system of claim 3, wherein the side mounting flanges are laterally inset from longitudinal side edges on the comb portion of the buttstock module to flushly mount the comb portion to the top of the buttstock. ### Claim 5 (depends on 2) The system of claim 2, wherein the buttstock includes a longitudinally-extending horizontal partition wall recessed within the open top, the partition wall being slidably engaged by a laterally spaced apart pair of downwardly projecting longitudinal side mounting flanges formed on the buttstock module. ### Claim 6 (depends on 1) The system of claim 1, wherein the rear mounting flange is laterally inset from vertical forward edges on the butt portion of the buttstock module to flusbly mount the butt portion to the rear end of the buttstock. ### Claim 7 (depends on 1) The system of claim 1, further comprising; a rearwardly open socket formed in the buttstock proximate to the front end; and a forwardly projecting front mounting flange slidably inserted into the socket for securing a front end of the buttstock module to the buttstock. ### Claim 8 (depends on 7) The system of claim 7, wherein the front mounting flange is inset from a front edge on the comb portion of the buttstock module to flushly mount the comb portion to the front end of the buttstock. ### Claim 9 (depends on 1) The system of claim 1, wherein the fastening mechanism includes a threaded fastener engageable with the buttstock module and buttstock. ### Claim 10 (depends on 9) The system of claim 9, wherein the fastener is a swivel stud screw. ### Claim 11 (depends on 1) The system of claim 1, wherein the buttstock is formed of a synthetic material, ### Claim 12 (depends on 1) The system of claim 1, wherein the buttstock module is formed of a synthetic material. ### Claim 13 (depends on 1) The system of claim 1, wherein the butt portion of the buttstock module has a first length, and further comprising a second buttstock module the same as the buttstock module but instead having, a butt portion with a second length different than the first length. ### Claim 14 (depends on 1) The system of claim 1, wherein the comb portion of the buttstock module has a first height, and further comprising a second buttstock module the same as the buttstock module but instead having a comb portion with a second height different than the first height. ### Claim 15 (depends on 1) The system of claim 1, wherein the rear butt portion of the buttstock module has a forward edge that has a complementary shape to a mating rear edge of the buttstock to form an even and flush interface therebetween. ### Claim 16 (depends on 1) The system of claim 1, wherein the buttstock is contiguous with and formed as part of a unitary monolithic stock including, a fore-end. ### Claim 17 (depends on 1) The system of claim 1, wherein the buttstock is cantilevered an(extends rearward from a grip of the firearm. ### Claim 18 A modular buttstock system for a firearm, the system comprising: a longitudinally-extending buttstock including a front end having a rearwardly open socket, a roar end, and an upwardly open channel extending between the front and rear ends; a buttstock module removably attached to the buttstock, the module including a longitudinally-extending upper comb portion positioned above the buttstock and a rear butt portion positioned at the rear end of the buttstock; the buttstock module further including a downwardly projecting longitudinally-extending side mounting flange inserted into the open channel and a forwardly projecting front mounting flange inserted into the socket; wherein the buttstock module encloses the buttstock when mounted on the firearm. ### Claim 19 (depends on 18) The system of claim 18, wherein the buttstock module includes a laterally spaced apart pair of downwardly projecting side mounting flanges inserted into the open channel of the buttstock. ### Claim 20 (depends on 19) The system of claim 19, wherein the pair of side mounting flanges of the buttstock module engage a laterally spaced apart pair of longitudinally-extending stub walls formed adjacent the open channel on the buttstock. ### Claim 21 (depends on 20) The system of claim 20, wherein the pairs of side mounting flanges and stub walls each gradually converge from the rear end of the buttstock moving towards the front end of the buttstock to form a wedging action for securing the buttstock module to the buttstock. ### Claim 22 (depends on 18) The system of claim 18, wherein the rearwardly open socket of the buttstock is located higher than a pair of longitudinally-extending top edges on the buttstock extending, from the front end towards the rear end of the buttstock. ### Claim 23 (depends on 18) The system of claim 18, wherein the buttstock further includes a right sidewall, a left sidewall, a closed bottom connecting the right and left sidewalls. ### Claim 24 (depends on 18) The system of claim 18, wherein the buttstock further includes an internal rearwardly open cavity extending between the front and rear ends. ### Claim 25 (depends on 24) The system of claim 24, wherein the upwardly open cavity of the buttstock is separated from the open cavity by a horizontal partition wall recessed below longitudinally-extending top edges of the buttstock. ### Claim 26 (depends on 25) The system of claim 25, further comprising a mounting block formed integrally with the partition wall and including a rearwardly open bore configured to receive a shank of a threaded listener at least partially therein for securing the buttstock module to the buttstock. ### Claim 27 (depends on 26) The system of claim 26, further comprising a receptacle in the mounting block having an open top that penetrates the partition wall for insertion of a fastening element configured to engage the threaded fastener. ### Claim 28 (depends on 18) The system of claim 18, further comprising a swivel stud screw inserted through a bottom of the buttstock and engaging a threaded nut disposed in the buttstock module for securing the buttstock module to the buttstock. ### Claim 29 (depends on 18) The system of claim 18, wherein the rear butt portion of the buttstock module has a forward edge that has a complementary shape to a mating rear edge of the buttstock to form an even and flush interface therebetween. ### Claim 30 A modular buttstock system for a firearm, the system comprising: a longitudinally-extending buttstock including a front end having rearwardly open socket and an open rear end; a buttstock module removably attached to the buttstock, the buttstock module including a longitudinally extending upper comb portion positioned above the buttstock and a rear butt portion positioned at the rear end of the buttstock; the buttstock module further including a forwardly projecting rear mounting flange inserted into the open rear end of the buttstock and a forwardly projecting front mounting flange inserted into the socket; wherein the buttstock module encloses the buttstock when mounted on the firearm, ### Claim 31 (depends on 30) The system of claim 30, further comprising a fastening mechanism for securing the buttstock module to the buttstock. ### Claim 32 (depends on 30) The system of claim 30, wherein the fastening mechanism includes a threaded fastener. ### Claim 33 (depends on 30) The system of claim 30, further comprising an internal rearwardly open cavity extending between the front and rear ends of the buttstock which forms the open rear end of the buttstock. ### Claim 34 A modular buttstock system for a firearm, the system comprising: a longitudinally-extending buttstock including a front end having rearwardly open socket, an open rear end, and an upwardly open channel extending between the front and rear ends; a buttstock module removably attached to the buttstock, the buttstock module including a longitudinally extending upper comb portion positioned above the buttstock and a rear butt portion positioned at the rear end of the buttstock; the buttstock module further including a forwardly projecting rear mounting flange inserted into the open rear end of the buttstock, a downwardly projecting side mounting flange inserted into the open channel, and a forwardly projecting front mourning flange inserted into the socket; wherein the buttstock module encloses the buttstock when mounted on the firearm. ### Claim 35 (depends on 34) The system of claim 34, wherein the buttstock module includes a laterally spaced apart pair of downwardly projecting side mounting flanges inserted into the open channel of the buttstock. ### Claim 36 (depends on 35) The system of claim 35, wherein the pair of side mounting flanges are contiguous with the front mounting flange in construction. ### Claim 37 (depends on 35) The system of claim 35, wherein the side mounting flanges are laterally inset below longitudinally-extending side edges of the comb portion of the buttstock module to form a smooth contour with opposing right and left sidewalls of the buttstock. ### Claim 38 (depends on 34) The system of claim 34, further comprising a fastening mechanism for securing the buttstock module to the buttstock. ### Claim 39 (depends on 34) The system of claim 34, wherein the fastening mechanism includes a threaded fastener. ### Claim 40 (depends on 34) The system of claim 34, further comprising an internal rearwardly open cavity extending between the front and rear ends of the buttstock which forms the open rear end of the buttstock. ### Claim 41 (depends on 34) The system of claim 34, wherein the buttstock module is funned of synthetic material. ### Claim 42 A method for assembling a buttstock module to a buttstock of a firearm the method comprising: providing a longitudinally-extending buttstock including a front end and an open rear end; providing a buttstock module including a longitudinally-extending upper comb portion and a downwardly extending rear butt portion; and axially inserting a forwardly projecting rear mounting flange on the buttstock module into the open rear end of the buttstock: wherein the comb portion of the buttstock is positioned above the buttstock and the rear portion of the buttstock module is positioned at the rear end of the buttstock. ### Claim 43 (depends on 42) The method of claim 42, further comprising inserting a pair of downwardly projecting longitudinal side mounting flanges into an upwardly open channel formed in a top of the buttstock. ### Claim 44 (depends on 43) The method of claim 43, further comprising axially sliding the side mounting flanges through the open channel from the rear end to the front end of the buttstock. ### Claim 45 (depends on 44) The method of claim 44, wherein the side mounting flanges are axially slid at least partially through the open channel before the rear mounting flange of the buttstock module is axially inserted into the open rear end of the buttstock. ### Claim 46 (depends on 44) The method of claim 44, wherein the pair of side mounting flanges of the buttstock module slidably engage a laterally spaced apart pair of longitudinally-extending stub walls formed adjacent the open channel on the buttstock. ### Claim 47 (depends on 42) The method of claim 42, further comprising axially inserting a forwardly projecting front mounting flange on the buttstock module into a rearwardly open socket formed in the buttstock. ### Claim 48 (depends on 42) The method of claim 42, further comprising inserting a threaded fastener through the buttstock module to threadably engage the buttstock to secure the buttstock module to the buttstock. ### Claim 49 (depends on 42) The method of claim 42, further comprising inserting a threaded fastener through the buttstock to threadably engage the buttstock module to secure the buttstock module to the buttstock. ### Claim 50 (depends on 42) The method of claim 42, wherein the buttstock includes an internal rearwardly open cavity extending between the front and rear ends that forms the open rear end of the buttstock, the rear mounting flange of the buttstock module being inserted at least partially into the cavity.