Expandable Insert Locking Assembly for Fixed Magazine Compliance
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Solution Overview
Problem
California and other states' laws require semi-automatic rifles to have fixed magazines that hold no more than 10 rounds, posing a need for converting non-compliant sporting rifles into compliant versions without the expense of new guns.
Innovation Solution
A loadable fixed ammunition magazine with a locking assembly that secures the magazine to the firearm's lower receiver, featuring a housing with a cartridge-loading compartment, follower assembly, and a horizontally expandable insert for secure attachment, ensuring the magazine cannot be detached without disassembling the rifle.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a detachable magazine is used in an AR-15 rifle, then ease of operation (loading/unloading) is improved, but compliance with California law requiring fixed magazines is worsened
Solution Approach 1:
The magazine system transitions from a permanently fixed state to a dynamically lockable state. The locking assembly includes a locking member that can engage with a locking surface on the magazine well, creating a fixed connection that prevents removal without disassembly. This dynamic locking mechanism allows the magazine to function as detachable during operation but becomes fixed when locked, satisfying legal requirements while maintaining operational flexibility.
2Adaptability or versatility
If a fixed magazine is installed to comply with California law, then legal compliance is improved, but ease of operation (replacing magazines) is worsened
Solution Approach 1:
The locking assembly provides a dynamic solution where the magazine can be securely fixed when needed and easily released when replacement is desired. The locking member can be actuated to engage or disengage from the locking surface, allowing users to convert between fixed and detachable states as needed. This resolves the contradiction by providing legal compliance through the locked fixed state while preserving operational flexibility through the ability to unlock and replace magazines.
3Adaptability or versatility
If a locking assembly is added to make the magazine fixed, then compliance with California law is improved, but device complexity is worsened
Solution Approach 1:
The locking assembly is designed as a separate, modular component that can be independently installed on the magazine well. The locking member is distinct from the magazine itself, allowing it to be added as a separate conversion component rather than integrating complexity into the magazine design. This segmentation approach minimizes overall system complexity while achieving the fixed magazine requirement.
Solution Approach 2:
The locking member acts as an intermediary element between the magazine and the rifle receiver. Rather than modifying the magazine or receiver fundamentally, the locking assembly serves as a mediating component that creates the fixed connection. This intermediary approach adds minimal complexity while effectively achieving legal compliance.
4Adaptability or versatility
If the magazine capacity is limited to 10 rounds to comply with California law, then legal compliance is improved, but productivity (firepower) is worsened
Solution Approach 1:
The magazine is pre-configured with a 10-round capacity to comply with California law, and the locking assembly is pre-installed to secure it in place. By preparing the system in advance with the legally required configuration, users can operate within legal constraints without needing to modify the system during use. The preliminary setup ensures both compliance and optimal performance within the legal framework.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The solution provides a cost-effective means to convert rifles into compliance by ensuring the magazine is fixed and cannot be removed without separating the rifle's receivers, meeting legal capacity limits while allowing easy loading and operation.
Implementation Method 1
The spring is configured to be compressed by the follower when the finger-pull is compressed by the follower when the finger-pull is engaged with the bottom hook, and to expand when the finger-pull is disengaged from the bottom hook, thereby allowing the follower to urge the stack of cartridges towards the mouth of the ammunition magazine.
Data Source
AI summary
A loadable ammunition magazine for use with a sporting firearm includes a housing defining a cartridge-loading compartment and a follower compartment, a cover that alternately covers and reveals the cartridge-loading compartment, and a follower that urges cartridges in the cartridge-loading compartment towards a mouth of the magazine. A locking assembly prevents the magazine from being detached from the lower receiver of the firearm without disassembly of the firearm action. In one embodiment, the locking assembly includes an expandable insert, and an actuator configured to expand from a first state wherein the outer surface of the insert is spaced from the well wall to a second state wherein the outer surface of the insert tightly engages the well wall.