Firearm Topcover Assembly with Lengthened Receiver Guides
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Solution Overview
Problem
The existing Squad Automatic Weapon (SAW) firearms, such as the M249 platform, face issues with inadequate cycling distance and ergonomics due to short receiver guides and stock placement, leading to reduced firing stability and operational inefficiencies, especially with larger cartridges like 7.62 mm NATO.
Innovation Solution
The design incorporates lengthened receiver guides and a reconfigured stock to increase the cycling distance and improve ergonomics, allowing for enhanced travel of the operating group and better alignment with the sights, while maintaining the use of standard components for efficient modification and cost-effectiveness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of moving object
If the receiver guides are shortened to reduce overall firearm length, then the firearm becomes more compact and easier to maneuver, but the cycling distance is reduced leading to reduced firing stability
Solution Approach 1:
The patent extends the receiver guides in a rearward direction beyond the traditional endpoint, creating additional cycling distance in the longitudinal dimension. This allows the operating group to travel further rearward, improving firing stability and recoil absorption without increasing the overall firearm length in other dimensions, as the extension is integrated into the existing receiver structure.
2Length of moving object
If the stock is repositioned forward to reduce the length of pull, then the firearm becomes more compact for close-quarters operation, but the cheek weld and sight alignment are degraded
Solution Approach 1:
The patent divides the stock into modular sections with adjustable positioning. The stock can be configured in different positions along the receiver, allowing the user to optimize between length of pull and cheek weld/sight alignment based on operational requirements. This segmentation enables independent adjustment of each component's position.
Solution Approach 2:
The stock incorporates adjustable and reconfigurable features that allow dynamic positioning during operation. The stock can be moved forward or backward relative to the receiver, and the feed tray cover can be adjusted independently, enabling the firearm to adapt to different operational scenarios and user preferences.
3Length of moving object
If the operating group travel is limited to maintain a compact design, then the firearm remains maneuverable, but the cycling distance is insufficient leading to operational inefficiencies
Solution Approach 1:
The patent extends the operating group's rearward travel by lengthening the receiver guides, allowing the operating group to access additional space in the longitudinal dimension. This increased travel distance improves operational efficiency for larger cartridges while maintaining a compact overall design through efficient spatial integration.
4Ease of manufacture
If standard components are used to reduce manufacturing costs, then the firearm is more cost-effective to produce, but design flexibility and optimization are limited
Solution Approach 1:
The patent uses standard, commercially available components such as the AR-15 style receiver, stock, and feed tray that can be sourced from multiple manufacturers. These universal components serve multiple functions and can be interchanged or adjusted without requiring custom fabrication, thereby reducing manufacturing costs while maintaining adequate design flexibility for the intended application.
Data Source
AI summary
A firearm, top cover, and feed lever. The feed lever includes a feed lever body having a feed lever track, wherein the feed lever body is configured to be pivotally mounted within a topcover assembly, and wherein the feed lever body is configured to pivot in response to a force transmitted by a roller of an operating group to the feed lever track during cycling of the firearm. The feed lever further includes a feed lever track first end, wherein the feed lever track first end comprises a feed lever track exit portion configured to receive the roller of the operating group after the roller exits the feed lever track via the feed lever track exit portion as the firearm cycles.