Universal AK-47 Bolt Hold Open Follower Design
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Solution Overview
Problem
Traditional Kalashnikov type firearm magazines do not have a universal cartridge follower that can effectively hold the rifle bolt open after the last cartridge is fired, limiting the ability to retrofit existing magazines and prevent the bolt from closing.
Innovation Solution
A cartridge follower with a cartridge receiving surface and side walls that intercept the firearm bolt, allowing it to bypass internal follower stops within the magazine, and a method to convert standard magazines into bolt hold open style by attaching a spring-loaded follower with specific dimensions and surface configurations to the magazine.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a traditional cartridge follower is used in a Kalashnikov magazine, then the magazine can be manufactured with simple internal structures and standard follower stops, but the bolt cannot be held open after the last cartridge is fired
Solution Approach 1:
The follower is segmented into multiple functional surfaces: a first surface for engaging traditional follower stops, a second surface for intercepting the bolt, and side walls with specific width variations. This segmentation allows the single follower component to perform multiple functions - both traditional follower stopping and bolt hold open - without requiring additional magazine modifications.
Solution Approach 2:
The follower is designed as a universal component that can simultaneously perform the traditional function of stopping at follower stops and the additional function of holding the bolt open. The multi-surface design allows it to interface with both the magazine's internal stops and the firearm's bolt, making it a multi-functional element that resolves the contradiction between reliability improvement and device complexity.
2Reliability
If the magazine body is modified to add bolt hold open functionality, then the bolt can be held open after the last cartridge is fired, but the magazine structure becomes more complex and requires modifications
Solution Approach 1:
The bolt hold open function is extracted from the magazine body and transferred to the follower component itself. By placing the bolt intercepting surface on the follower rather than adding structures to the magazine, the invention eliminates the need for magazine modifications while achieving the desired reliability improvement.
Solution Approach 2:
The follower is designed to perform the bolt hold open function autonomously through its own geometric features (the second surface and side wall configuration) without requiring external assistance from modified magazine structures. The follower's own geometry enables it to intercept and hold the bolt open.
3Adaptability or versatility
If a universal follower design is implemented, then the same follower can work with various Kalashnikov magazine types, but the follower geometry becomes more complex to accommodate different magazine configurations
Solution Approach 1:
The follower employs local quality variations through its multi-surface geometry, where different surfaces have specific characteristics optimized for different functions. The first surface is configured for engaging follower stops, the second surface for bolt interception, and side walls with varying widths for navigating magazine constraints. This localized differentiation enables universal compatibility without requiring a completely complex overall shape.
Solution Approach 2:
The follower design utilizes dimensional variations, particularly in the side wall widths (first width versus second width), to create clearance paths that allow the follower to bypass internal magazine structures. This dimensional approach enables the follower to adapt to various magazine geometries by navigating through available spaces rather than confronting obstacles directly.
Data Source
AI summary
A universal cartridge follower for a firearm magazine comprising a cartridge receiving surface and side walls extending from the cartridge receiving surface. The cartridge receiving surface is operationally configured to intercept a firearm bolt. The side walls extend from the cartridge receiving surface and have opposing first surfaces defining a first width of the cartridge receiving surface and at least opposing second surfaces defining a second width of the cartridge receiving surface.