Dec 23, 2025
The present invention is a modular firearm lower receiver assembly for rapid conversion of conventionally configured modular firearms to a bullpup configuration and the method of assembly thereof. The preferred embodiment of the present invention is intended for designed use with modular firearms in the family AR-15 Type Firearms and enables a rapid conversion of a wide array of conventionally configured AR-15 Type Firearm to and a bullpup configuration. Such rapid conversion, which can generally be performed in a matter of seconds without any tools, is accomplished by decoupling and detaching the two captured receiver pins on the lower receiver of the conventionally configured AR-15 Type Firearm, removing the upper receiver assembly therefrom, and recoupling such upper receiver assembly to the present invention using two identically located receiver pins on the present invention. The present invention is universally applicable to AR-15 Type firearms of several different calibers and having an array of differences with respect to the lower receiver, upper receiver, handguard, bolt carrier group, or gas systems employed therein.
