Self-Deploying Firearm Stock with Top-Rail Sliding Beam
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Solution Overview
Problem
Collapsible rifle stocks for AR-pattern firearms face limitations due to the standard extension tube, which restricts stock length reduction and can prevent action cycling when folded, and existing designs may not be compatible with all upper receivers, causing interference with other firearm components.
Innovation Solution
A collapsible stock with a sliding beam attachable to the top accessory rail, featuring a latch system and a deployment spring for self-deployment, allowing the stock to collapse to a minimal length without the need for a buffer tube and ensuring compatibility with various upper receiver designs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of moving object
If a standard extension tube is used to house the buffer and recoil spring, then the firearm can maintain proper cycling function, but the stock length cannot be significantly reduced
Solution Approach 1:
The patent extracts the buffer and recoil spring from the traditional extension tube location and relocates them inside the upper receiver. This eliminates the need for a separate extension tube, allowing the stock to be significantly shorter while maintaining proper cycling function. The buffer tube is now housed within the upper receiver's existing structure.
Solution Approach 2:
The patent merges the buffer tube housing function into the upper receiver structure. Instead of having separate components (extension tube + upper receiver), the upper receiver itself serves as the buffer tube housing, combining two functions into one integrated structure.
2Length of moving object
If the stock is folded to minimal length, then compactness is improved, but the action cycling may be prevented
Solution Approach 1:
By extracting the buffer and recoil spring from the extension tube and relocating them inside the upper receiver, the patent creates sufficient clearance that allows the stock to be folded to minimal length without interfering with the cycling action. The buffer has enough travel space within the upper receiver even when the stock is collapsed.
3Device complexity
If alternate stock designs attach directly to the threaded interface at the rear of the lower receiver, then the extension tube is eliminated, but compatibility with various upper receiver designs may be compromised
Solution Approach 1:
The patent designs the buffer tube to be housed within the upper receiver itself, making the upper receiver universal in its ability to accommodate the buffer and recoil spring. This design works with various upper receiver designs without requiring specific modifications, as the buffer tube integration is part of the upper receiver's standard structure.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Enables a compact, self-deploying stock that maintains functionality and compatibility with different firearm configurations, allowing for seamless cycling and accessory mounting without the limitations of traditional designs.
Implementation Method 1
A spring is contained within the sliding beam and biased to push the sliding beam to the deployed position
Data Source
AI summary
Provided is a collapsible stock for mounting to the top surface of a firearm. It includes a sliding beam slidably attachable to the top surface and slidable between collapsed and deployed positions. A butt member is on the sliding beam and a latch is configured to releasably hold the sliding beam in at least the collapsed and deployed positions.