# US 12,222,177 B2 · Rifle conversion devices and method > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 12,222,177 B2 - Document ID: US12222177B2 - Status: Granted - Kind: B2 - Application number: 17/061,481 - Filed: 2020-10-01 - Published: 2022-04-07 - Granted: 2025-02-11 - Earliest claimed: 2020-10-01 - Applicants: Thomas Edward Klein - Inventors: Thomas Edward Klein - Web page: https://patentgrep.com/patent/US12222177B2 ## CPC - F41A 21/48: Barrel mounting means, e.g. releasable mountings for replaceable barrels - F41A 3/66: Breech housings or frames; Receivers - F41C 23/16: Forestocks; Handgrips; Hand guards (pump-action guns F41C7/02) - F41A: FUNCTIONAL FEATURES OR DETAILS COMMON TO BOTH SMALLARMS AND ORDNANCE, e.g. CANNONS; MOUNTINGS FOR SMALLARMS OR ORDNANCE - 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 ## Abstract Conversion devices and methods for converting a chassis style rifle to function as a traditional bolt style rifle. The conversion device includes a conversion component that attaches to a standard or modified standard lower receiver of a rifle to allow the rifle to remain capable of being used as either a chassis gun or standard rifle configuration as desired by the operator. The conversion component may attach to the magazine well of the rifle. The conversion component is removably installable on the lower receiver, and accessories, such as a forearm or handguard, may be removably attached to a conversion component and are supported by the lower receiver. The configuration eliminates the need to contact the upper receiver during the act of firing a shot, particularly for gripping with the off-hand or resting on separate shooting accessories. The accuracy and precision of the rifle are enhanced. ## Claims ### Claim 1 In a rifle having a receiver assembly comprising an upper receiver assembly including an upper receiver and action components and a barrel having a barrel forend, and a lower receiver assembly that includes a lower receiver and fire controls, the lower receiver including a magazine well and a trigger guard forming a loop disposed behind the magazine well, the improvement comprising: a conversion adapter comprising a removable mount piece that is removably securable to the magazine well, wherein when said mount piece is connected to said lower receiver the mount piece does not contact the upper receiver, wherein the mount piece comprises an accessory connector that is configured to releasably connect with one or more accessories to mount the one or more accessories to the rifle via the accessory connector, wherein said accessory connector provides a point of connection for connecting said one or more accessories to the rifle, and wherein said point of connection is located in front of the magazine well; wherein the mount piece, when attached to the rifle, engages multiple surfaces of the lower receiver, including surfaces of the magazine well; and wherein the mount piece is removably securable to the magazine well and includes a mounting connector that is disposed in the loop. ### Claim 2 (depends on 1) The rifle of claim 1, wherein the one or more accessories are supported only on the lower receiver, and do not engage with the upper receiver. ### Claim 3 (depends on 2) The rifle of claim 2, wherein said one or more accessories comprises a handguard. ### Claim 4 (depends on 1) The rifle of claim 1, further comprising a fastener that is adjustably tensionable to provide a clamping force to releasably secure said mount piece to said surfaces of the magazine well. ### Claim 5 (depends on 1) The rifle of claim 1, further comprising a fastener that is adjustably tensionable to provide a clamping force to removably secure the removable mount piece to said lower receiver. ### Claim 6 (depends on 5) The rifle of claim 5, wherein said mount piece comprises a first mount body section and a second mount body section which are joined to form the accessory connector. ### Claim 7 (depends on 6) The rifle of claim 6, wherein said first mount body section and said second mount body section each include a rear flange and a front flange, wherein a joining piece joins the rear flanges of the respective first and second mount body sections. ### Claim 8 (depends on 1) The rifle of claim 1, wherein said mount piece includes a mount body and a mounting plate, the mount body including at least one flange that includes thereon the accessory connector that is configured to connect with the one or more accessories. ### Claim 9 (depends on 8) The rifle of claim 8, wherein said at least one flange is a front flange, and wherein said mount body has at least one rear flange, and wherein said plate is configured to connect with said at least one rear flange of said mount body. ### Claim 10 (depends on 9) The rifle of claim 9, including a fastener that fastens the plate to said at least one rear flange of said mount body. ### Claim 11 (depends on 9) The rifle of claim 9, wherein said at least one rear flange of said mount body comprises at least two rear flanges, and wherein said plate is securable to said at least two rear flanges. ### Claim 12 (depends on 9) The rifle of claim 9, wherein said mount body includes at least another front flange, and wherein said two front flanges of the mount body join together to form the accessory connector that is configured to connect with the one or more accessories, wherein said mount body engages the surfaces of the magazine well. ### Claim 13 (depends on 1) The rifle of claim 1, wherein said mount piece comprises a plurality of portions securable to the magazine well. ### Claim 14 A method for converting a rifle that has a receiver assembly comprising an upper receiver assembly including an upper receiver and action components and a barrel, and a lower receiver assembly that includes a lower receiver and fire controls, the lower receiver having a plurality of surfaces and including a magazine well, the upper receiver assembly and the lower receiver assembly forming an original configuration of the rifle, comprising: a) removably installing a conversion device onto the lower receiver by attaching the conversion device to the rifle by engaging multiple surfaces of the plurality of surfaces of the lower receiver, including surfaces of the magazine well, with the conversion device to removably fix the conversion device onto the magazine well; b) wherein the conversion device includes or is configured to connect with one or more accessories that do not contact the upper receiver assembly; c) wherein said conversion device is supported on said lower receiver only and does not contact the upper receiver assembly; and d) detaching the conversion device from the rifle to restore the rifle to the original configuration; e) wherein, when the conversion device is detached from the magazine well, the rifle remains free of the conversion device; f) wherein the conversion device comprises a mount piece, and wherein removably installing the conversion device comprises installing the mount piece onto the magazine well of the lower receiver by engaging the multiple surfaces of the plurality of surfaces of the lower receiver, including the surfaces of the magazine well, with the mount piece; g) wherein the magazine well comprises a wall, and wherein installing the mount piece onto the magazine well of the lower receiver comprises installing the mount piece to the magazine well wall; h) wherein said mount piece comprises a plurality of portions securable to the magazine well wall; and i) wherein the rifle includes a trigger guard with a trigger guard space, and wherein at least one of said plurality of mount piece portions securable to the magazine well wall passes through the trigger guard space. ### Claim 15 (depends on 14) The method of claim 14, wherein said plurality of mount piece portions include at least one first mount portion, at least one second mount portion and a plate, wherein one of the at least one first mount portion and the at least one second mount portion is securable to the magazine well wall, passes through the trigger guard space, and comprises the plate, and wherein said plate connects together the at least one first mount portion and the at least one second mount portion. ### Claim 16 (depends on 15) The method of claim 15, including attaching at least one of said one or more accessories to said mount piece. ### Claim 17 (depends on 16) The method of claim 16, including detaching at least one of said one or more accessories from said mount piece. ### Claim 18 (depends on 14) The method of claim 14, including attaching at least one of said one or more accessories to said mount piece. ### Claim 19 (depends on 18) The method of claim 18, including detaching at least one of said one or more accessories from said mount piece. ### Claim 20 (depends on 14) The method of claim 14, wherein said one or more accessories are removable accessories, and wherein the mount piece includes a front flange, and wherein said front flange is configured to connect with said removable accessories. ### Claim 21 (depends on 14) The method of claim 14, wherein said one or more accessories are removable accessories, and wherein said mount piece includes at least one of said removable accessories. ### Claim 22 (depends on 14) The method of claim 14, wherein the plurality of portions of the mount piece comprises a first mount portion and a second mount portion, and wherein installing the mount piece includes connecting together said first mount portion and said second mount portion, wherein when connected together, said first mount portion and said second mount portion engage the surfaces of the magazine well and form a connecting point at the front of the magazine well for connecting with said one or more accessories. ### Claim 23 (depends on 14) The method of claim 14, wherein the conversion device further comprises a fastener that is adjustably tensionable to provide a clamping force to removably secure the mount piece to said lower receiver, and adjusting the fastener to removably secure and release the conversion device to the lower receiver. ### Claim 24 (depends on 14) The method of claim 14, wherein said plurality of portions of said mount piece comprises a first mount body section and a second mount body section that join to form an accessory connector; and forming the accessory connector by joining the first mount body section and the second mount body section. ### Claim 25 (depends on 24) The method of claim 24, wherein said first mount body section and said second mount body section each include a rear flange and a front flange, wherein a joining piece joins the rear flanges of the respective first and second mount body sections, and joining the rear flanges of the respective first and second mount body sections. ### Claim 26 (depends on 14) The method of claim 14, wherein said plurality of portions of said mount piece includes a mount body and a mounting plate, the mount body including at least one flange that includes thereon an accessory connector that connects with the one or more accessories, and connecting the one or more accessories to the accessory connector. ### Claim 27 (depends on 26) The method of claim 26, wherein said at least one flange is a front flange, and wherein said mount body has at least one rear flange, and wherein said plate connects with said at least one rear flange of said mount body, and connecting said plate with said at least one rear flange of said mount body. ### Claim 28 (depends on 27) The method of claim 27, wherein the conversion device comprises a fastener, and wherein said plate is connected with said at least one rear flange of said mount body using the fastener. ### Claim 29 (depends on 27) The method of claim 27, wherein the at least one rear flange of said mount body comprises at least two rear flanges, and securing said plate to said at least two rear flanges. ### Claim 30 (depends on 27) The method of claim 27, wherein said mount body includes at least another front flange, and joining said two front flanges of the mount body together to form the accessory connector that connects with the one or more accessories, wherein said mount body engages the surfaces of the magazine well when the two front flanges of the mount body are joined together.