Shell Stripper Assembly for Firearm Magazine Round Stripping
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Solution Overview
Problem
Conventional firearms with large breech bolt diameters face reliability issues in stripping rounds from magazines due to the cylindrical shape of the breech bolt, which requires a larger magazine opening, imposing undesirable dimensional constraints.
Innovation Solution
A shell stripper assembly with a body having legs and a guide rail system that cooperates with the firearm's action mechanism to strip rounds from the magazine, minimizing the breech bolt's diameter and allowing the magazine to be supported at a non-zero angle for efficient round engagement and removal.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the breech bolt diameter is increased to improve chamber sealing, then the chamber sealing is improved, but the magazine opening size increases and round stripping reliability decreases
Solution Approach 1:
The invention divides the sealing function from the stripping function. The breech bolt is designed with a reduced diameter for efficient round stripping, while a separate chamber seal component (such as a seal ring or seal groove in the chamber wall) provides the necessary chamber sealing. This segmentation allows each component to be optimized for its specific function without compromise.
Solution Approach 2:
The sealing function is extracted from the breech bolt and assigned to a dedicated sealing component. This extraction allows the breech bolt to be minimized in diameter for optimal stripping performance while the separate seal component ensures proper chamber sealing. The seal may be integrated into the chamber wall or provided as a removable seal ring.
2Strength
If the breech bolt diameter is increased to maintain structural integrity, then structural integrity is improved, but the magazine opening size increases and firearm dimensions increase
Solution Approach 1:
The structural functions are segmented between the breech bolt and the receiver/chamber assembly. The breech bolt is optimized for stripping with minimal diameter, while the receiver and chamber structure provide the necessary overall structural integrity. This allows the magazine opening to be minimized while maintaining firearm strength through proper receiver design.
Solution Approach 2:
The receiver and chamber assembly serve multiple functions: providing structural integrity for the firearm, containing the chamber seal, and supporting the magazine. This multi-functionality allows the breech bolt to be minimized for stripping efficiency while the receiver maintains overall structural strength and supports various magazine configurations.
3Productivity
If the breech bolt diameter is reduced to improve round stripping efficiency, then round stripping efficiency is improved, but chamber sealing capability deteriorates
Solution Approach 1:
The sealing function is extracted from the breech bolt and assigned to a dedicated sealing component positioned in the chamber. This allows the breech bolt to be reduced in diameter for optimal stripping efficiency while the separate seal component (such as a seal ring or integrated seal groove) provides adequate chamber sealing capability.
Solution Approach 2:
A separate seal component acts as an intermediary between the breech bolt and the chamber wall. This intermediary element provides the sealing function that would otherwise require a larger breech bolt diameter, allowing the bolt to be minimized for efficient round stripping while the seal mediator ensures proper chamber sealing.
4Ease of operation
If the magazine opening size is increased to accommodate larger breech bolt, then breech bolt access is improved, but magazine dimensions increase and handling becomes more difficult
Solution Approach 1:
The functions of round stripping and chamber sealing are segmented, allowing the breech bolt to be reduced in diameter. This reduction enables the magazine opening to be minimized, resulting in more compact magazine dimensions and improved handling characteristics while maintaining adequate access for the streamlined breech bolt to perform its stripping function.
Data Source
AI summary
A shell stripper assembly includes a shell stripper, a stripper guide, a stripper guide plate, and a magazine insert. The shell stripper strips the top round from the firearm magazine so that it can be picked up by the firearm breech bolt. The shell stripper slides between guide rails of the stripper guide, and its motion is controlled by the stripper guide plate.