Bolt Catch Apparatus for Selective Magazine Retention
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Solution Overview
Problem
Current methods for converting semi-automatic firearms with detachable magazines to fixed magazines are either cumbersome or render the firearm inoperable, failing to provide a convenient and effective solution that complies with legal requirements.
Innovation Solution
The implementation of a bolt catch apparatus with a catch plate that selectively contacts the upper and magazine release bar, preventing magazine actuation until the firearm is disassembled, allowing for a safe and legal conversion to a fixed magazine configuration without altering the magazine release button assembly or eliminating the bolt catch.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a bullet button modification is used to prevent magazine removal, then the magazine cannot be removed without a tool, but the modification becomes illegal under current assault weapon definitions
Solution Approach 1:
The bolt catch assembly is designed to dynamically change its function based on the position of the catch plate. When the catch plate is in the first position, the bolt catch prevents magazine removal (fixed magazine mode). When the catch plate is in the second position, the magazine can be removed normally (detachable magazine mode). This dynamic reconfiguration allows the same mechanism to satisfy different legal requirements.
Solution Approach 2:
The bolt catch assembly is segmented into multiple functional components: the bolt catch body, the catch plate with two distinct positions, and the magazine release bar. This segmentation allows independent control of magazine retention and magazine release functions, enabling the system to toggle between fixed and detachable magazine configurations.
2Reliability
If the magazine release button assembly is modified to prevent magazine actuation, then magazine removal is prevented, but the magazine release function is compromised
Solution Approach 1:
The catch plate acts as an intermediary element between the magazine release bar and the bolt catch. It transfers and controls the force applied to the magazine release bar, allowing selective prevention of magazine actuation while preserving the magazine release function when the catch plate is in the appropriate position.
3Reliability
If the bolt catch is removed or modified to prevent magazine release, then magazine actuation is prevented, but the bolt catch function is eliminated
Solution Approach 1:
The bolt catch assembly is designed to perform multiple functions: it prevents magazine removal when the catch plate is in the first position, and it enables normal magazine removal when the catch plate is in the second position. The same assembly also maintains the bolt catch function for cycling the action, making it a universal component that satisfies both magazine retention and firearm functionality requirements.
Data Source
AI summary
Apparatuses and methods to convert a semi-automatic firearm with a detachable magazine to a semi-automatic firearm with a fixed magazine and release mechanism, including one or more of a catch plate, a modified bolt catch, and/or a modified magazine release bar.