Side Charging Handle for AR Firearms
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Solution Overview
Problem
AR-pattern firearms face challenges with the standard rearward receiver extension tube, which complicates the use of folding buttstocks, can render the firearm inoperable if damaged, and is an awkward protrusion when configured as a handgun, while the standard T-shaped charging handle is not ergonomically ideal and allows hot gas to escape near the user's face.
Innovation Solution
A side-located, non-reciprocating charging handle and a shortened bolt carrier and recoil spring assembly that can be housed entirely within the upper receiver, featuring a bolt carrier assembly with a side longitudinal guide slot and a recoil spring guide channel, allowing the bolt carrier to reciprocate independently of the charging handle.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of moving object
If a rearward receiver extension tube is used to house the recoil spring and bolt carrier assembly, then the bolt carrier can reciprocate with sufficient travel, but the firearm becomes awkward when configured as a handgun and folding buttstocks cannot be used
Solution Approach 1:
The patent repositions the charging handle from the traditional rearward axial position to a lateral position on the side of the receiver. This dimensional change allows the bolt carrier assembly to reciprocate entirely within the upper receiver without requiring a rearward extension tube, enabling handgun configuration and folding buttstock compatibility while maintaining sufficient reciprocation travel through the lateral guide slot mechanism
2Device complexity
If a standard T-shaped rear charging handle is used, then the charging mechanism is simple, but hot gas escapes near the user's face and the handle is not ergonomically ideal
Solution Approach 1:
Instead of having the charging handle reciprocate with the bolt carrier in the traditional rearward direction, the patent inverts the approach by positioning the charging handle laterally on the side of the receiver with its handle portion extending perpendicular to the bore axis. The charging handle moves laterally within a guide slot rather than axially, which prevents hot gas escape near the user's face while maintaining functional simplicity
3Length of moving object
If the bolt carrier assembly extends beyond the upper receiver, then sufficient reciprocation travel is achieved, but the firearm structure becomes more complex and vulnerable to damage
Solution Approach 1:
The patent nests the entire bolt carrier assembly and recoil spring within the upper receiver by using a lateral guide slot that allows the bolt carrier to reciprocate fully inside the receiver boundaries. The charging handle engages the bolt carrier through this lateral slot, enabling complete containment of moving parts within the receiver without extension tubes, thereby reducing structural complexity and vulnerability to damage
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 and ergonomic design that eliminates the need for a rearward receiver extension tube, allows for the use of folding buttstocks, and prevents hot gas escape, improving usability and reliability by housing the recoil spring and bolt carrier within the upper receiver.
Implementation Method 1
A side-located, non-reciprocating charging handle and a shortened bolt carrier and recoil spring assembly
Data Source
AI summary
Provided is a side charging handle system for an AR-pattern firearm with an upper receiver having an internal longitudinal bore for receiving a bolt carrier assembly for longitudinal reciprocation therein, a side longitudinal guide slot, and a side charging handle having an engagement pin extending through guide slot to engage the bolt carrier assembly.