May 5, 2026

US12618624 - Modular bolt action rifle

The present disclosure presents a modular bolt action rifle system with roller bearings having an upper receiver assembly housing a barrel, a lower receiver assembly comprising an AR-style fire control system and a magazine well, a bolt carrier group assembly including a bolt carrier, top roller bearings and side roller bearings, and a handguard assembly, wherein the lower receiver assembly and its AR-style fire control and magazine well are releasably attached to the upper receiver, and prior to attachment of the barrel assembly the bolt carrier group assembly, consisting of the bolt carrier, bolt head, bolt charging handle, top roller bearings, and side roller bearings is inserted unto the upper receiver. An extension of the barrel assembly is releasably attached to the upper receiver. The barrel assembly is releasably secured by releasable attachment of the handguard assembly to a barrel extension receiver of the upper receiver assembly.

Assignee: Defense Research and Development, LLC
Inventors: Swetal K. Patel
Filing date: 2023-09-11

firearmriflebolt-actionmodular

The patent describes a modular bolt action rifle system that features an upper receiver assembly with a barrel, a lower receiver with an AR-style fire control system, and a bolt carrier group that utilizes roller bearings for enhanced operation. The design allows for the upper and lower receiver assemblies, as well as the barrel and magazine well, to be easily attached and detached, facilitating customization and maintenance.

Claim 1

1 . A modular bolt-action rifle system, comprising: an upper receiver assembly comprising a bolt carrier group assembly; a fire control system; a magazine well; a barrel assembly; and a handguard assembly; wherein the upper receiver assembly is releasably attached to the fire control system, the magazine well is releasably attached to the upper receiver assembly by inserting the magazine well into a channel on an underside of the upper receiver assembly, and the barrel assembly is releasably attached to the upper receiver assembly into a barrel receiver extension with a detente at a 12 o’clock position; and wherein the barrel assembly and magazine well are releasably secured by releasable attachment of the handguard assembly to the barrel receiver extension of the upper receiver assembly by insertion of one or more shoulder screws. an upper receiver assembly comprising a bolt carrier group assembly; a fire control system; a magazine well; a barrel assembly; and a handguard assembly; wherein the upper receiver assembly is releasably attached to the fire control system, the magazine well is releasably attached to the upper receiver assembly by inserting the magazine well into a channel on an underside of the upper receiver assembly, and the barrel assembly is releasably attached to the upper receiver assembly into a barrel receiver extension with a detente at a 12 o’clock position; and wherein the barrel assembly and magazine well are releasably secured by releasable attachment of the handguard assembly to the barrel receiver extension of the upper receiver assembly by insertion of one or more shoulder screws.

Google Patents

https://patents.google.com/patent/US12618624

USPTO PDF

https://image-ppubs.uspto.gov/dirsearch-public/print/downloadPdf/12618624