Modular Bolt Carrier Group Assembly Design
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Solution Overview
Problem
The existing bolt carrier groups in firearms, such as the AR15/M16 family, are expensive to manufacture and difficult to assemble, necessitating a more cost-effective and efficient design.
Innovation Solution
The bolt carrier group is composed of coupled bolt carrier sections with protruding pins and apertures, utilizing a coupling pin to secure the sections together, allowing for easy assembly and disassembly, and is designed for use in both direct impingement and blowback AR-type rifles.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If traditional bolt carrier design is used, then manufacturing precision and reliability are maintained, but manufacturing cost increases and assembly difficulty increases
Solution Approach 1:
The bolt carrier is divided into multiple modular sections (bolt carrier body, bolt carrier key, firing pin, cam pin, etc.) that can be manufactured separately and assembled together. This segmentation allows each component to be optimized for manufacturing and enables easier assembly/disassembly while maintaining overall reliability.
2Ease of manufacture
If traditional bolt carrier design is used, then functional reliability is maintained, but manufacturing cost increases
Solution Approach 1:
Multiple functional components are merged into an integrated bolt carrier assembly where the bolt carrier body, bolt carrier key, firing pin, and cam pin work together as a unified system. This merging ensures proper functional integration and reliability while allowing cost-effective manufacturing of individual components.
3Ease of operation
If traditional bolt carrier design is used, then structural integrity is maintained, but assembly difficulty increases
Solution Approach 1:
Smaller components such as the bolt carrier key, firing pin, and cam pin are nested within or attached to the bolt carrier body in a hierarchical structure. This nesting approach allows for simplified assembly where components fit into predetermined positions while maintaining the structural integrity of the overall assembly.
Data Source
AI summary
A bolt carrier group and a method for manufacturing it are disclosed. The bolt carrier group contains a first bolt carrier section containing a first end and a second end, a second bolt carrier section containing a first end and a second end, a plurality of pins positioned between the first bolt carrier section and the second bolt carrier section, a coupling pin configured to prevent decoupling of the first bolt carrier section from the second bolt carrier section.