Bullpup Lower Receiver Assembly for Tool-Free AR-15 Conversion
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Solution Overview
Problem
There is no commercially viable solution for converting AR-15 Type Firearms between conventional and bullpup configurations rapidly and universally without requiring proprietary parts or significant user assembly, and existing conversion kits often result in operational risks and inefficiencies.
Innovation Solution
A modular, unified single-unit bullpup-configured lower receiver assembly that allows for a 'Hot Swap' conversion between conventional and bullpup configurations by using standard AR-15 components, incorporating a Pull Style Trigger Linkage System for efficient and safe operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a bullpup conversion kit is used to convert AR-15 Type Firearms, then the firearm can be converted to bullpup configuration, but the conversion requires proprietary parts and significant user assembly which increases device complexity and reduces ease of operation
Solution Approach 1:
The lower receiver assembly is designed with universal compatibility to work with both conventional and bullpup configurations. The receiver incorporates standardized interfaces and mounting points that accommodate different stock types and trigger linkage arrangements, allowing a single receiver design to serve multiple configuration needs without requiring proprietary conversion parts.
Solution Approach 2:
The trigger linkage system is divided into separate, modular components including the trigger group, linkage bar, and stock assembly. This segmentation allows the trigger group to remain in its original position within the lower receiver while the linkage mechanism connects to either conventional or bullpup stocks through standardized interfaces, simplifying the conversion process.
2Adaptability or versatility
If existing conversion kits are used, then bullpup configuration is achieved, but operational risks increase due to improper assembly and incompatibility issues
Solution Approach 1:
The lower receiver assembly incorporates pre-engineered safety features including built-in alignment guides, indexed mounting positions, and interference-fit connections that prevent improper assembly. These design elements ensure that components can only be assembled in the correct configuration, eliminating operational risks associated with user assembly errors.
Solution Approach 2:
The trigger linkage system is designed with self-aligning features and snap-fit connections that automatically ensure proper positioning during assembly. The components guide themselves into the correct configuration without requiring precision alignment by the user, and the assembly includes built-in checks that prevent incorrect installation.
3Ease of operation
If rapid conversion is implemented without proprietary parts, then ease of operation improves, but manufacturing precision requirements increase to ensure compatibility
Solution Approach 1:
The lower receiver assembly utilizes standardized parameter dimensions and tolerance specifications that are compatible with existing AR-15 Type Firearms manufacturing standards. By adhering to established dimensional parameters for receiver interfaces, mounting holes, and linkage connections, the design achieves rapid convertibility without requiring ultra-precise manufacturing beyond conventional tolerances.
Solution Approach 2:
The receiver design incorporates universal mounting interfaces and standardized connection points that work across different firearm configurations. These universal features are manufactured using conventional precision standards rather than custom tolerances, enabling rapid conversion while maintaining compatibility through proven manufacturing capabilities.
Data Source
AI summary
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.