Aug 12, 2025

US12385702 - Jig for manufacturing of firearm lower receiver

An improved jig for manufacturing a firearm lower receiver is comprised of a power tool mount; an adapter; a guide plate with plate screws; a rear support with mounting screws; a front support; and at least one of a carriages with at least one locating pin. A guide plate is disposed below the top surface of a lower receiver in conjunction with an adapter. The jig is a universal fitment and includes a bearing to support a rotary tool and at least one guiding feature can be used to facilitate in the guidance of the rotary tool without placing the rotary tool in direct contact with any of the guidance features. A removable locating pin is situated a long the front and rear takedown pin holes of a firearm receiver that is not threaded and is provided with at least one of a pull, string or other handle.

Assignee: BlackHawk Manufacturing Group, Inc.
Inventors: Wayne R. Partington
Filing date: 2022-07-21

firearmmanufacturinglower receiverjig

The patent describes an innovative jig designed for the manufacturing of firearm lower receivers, featuring components such as a guide plate, adapters, and support structures that facilitate the use of a rotary tool. This jig allows for precise alignment and support during the machining process, ensuring that the rotary tool operates without direct contact with guiding features.

Claim 1

A method for forming a jig assembly, comprising: providing a jig including a guide plate configured to be disposed below a top surface of an unfinished lower receiver, a front takedown adapter configured to couple the guide plate with one or more front takedown holes of an unfinished lower receiver, a buffer adapter, a first side plate, and a second side plate, threading the buffer adapter into a buffer mount of the unfinished lower receiver; orienting the front takedown adapter between the front takedown holes on the unfinished lower receiver, the first side plate on a first side of the unfinished lower receiver, the second side plate on a second side of the unfinished lower receiver; threading the first side plate into the second side plate; placing the guide plate atop the first side plate and second side plate; and aligning holes in the guide plate with threaded holes in the front takedown adapter and threaded holes in the buffer adapter. providing a jig including a guide plate configured to be disposed below a top surface of an unfinished lower receiver, a front takedown adapter configured to couple the guide plate with one or more front takedown holes of an unfinished lower receiver, a buffer adapter, a first side plate, and a second side plate, threading the buffer adapter into a buffer mount of the unfinished lower receiver; orienting the front takedown adapter between the front takedown holes on the unfinished lower receiver, the first side plate on a first side of the unfinished lower receiver, the second side plate on a second side of the unfinished lower receiver; threading the first side plate into the second side plate; placing the guide plate atop the first side plate and second side plate; and aligning holes in the guide plate with threaded holes in the front takedown adapter and threaded holes in the buffer adapter.

Google Patents

https://patents.google.com/patent/US12385702

USPTO PDF

https://image-ppubs.uspto.gov/dirsearch-public/print/downloadPdf/12385702