AR Lower Receiver Grip Integration for Legislative Compliance
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Solution Overview
Problem
AR15-type rifles face legislative restrictions in many states that prohibit the combination of a detachable magazine and a pistol grip, necessitating a design that permanently omits the conventional pistol grip while retaining the detachable magazine feature.
Innovation Solution
An AR-type lower receiver with a supplemental opening for the middle finger and a curved boundary surface for thumb and index finger engagement, integrating the grip into the body of the weapon, eliminating the need for a protruding pistol grip.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a conventional pistol grip is used on an AR15-type rifle, then the ease of operation is improved, but the weapon violates state legislation that prohibits the combination of pistol grip and detachable magazine
Solution Approach 1:
The pistol grip functionality is segmented from the conventional protruding structure and redistributed to multiple surfaces on the lower receiver body. The supplemental opening, curved boundary surface, and grip engagement surfaces collectively provide grip functionality without forming a traditional pistol grip assembly.
Solution Approach 2:
Instead of providing grip engagement in the conventional protruding direction (perpendicular to the receiver), the grip surfaces are distributed across multiple dimensions on the receiver body - including the supplemental opening for finger insertion, curved boundary surfaces for thumb engagement, and grip engagement surfaces on the sides, creating a multi-dimensional grip interface.
2Object-affected harmful factors
If the pistol grip feature is permanently omitted to comply with legislation, then legislative compliance is improved, but the ease of operation deteriorates due to lack of proper grip support
Solution Approach 1:
The grip functionality is merged with the lower receiver body itself. The curved boundary surface and grip engagement surfaces are integrated into the receiver structure, eliminating the need for a separate pistol grip component while maintaining operational functionality.
Solution Approach 2:
The lower receiver body serves multiple functions: it houses the trigger mechanism, provides structural support, and simultaneously provides grip engagement surfaces. The curved boundary surface and supplemental opening transform the receiver into a multi-functional component that both operates the weapon and provides ergonomic grip support.
3Adaptability or versatility
If a detachable magazine is retained on an AR15-type rifle, then the adaptability is improved, but the weapon violates state legislation when combined with a pistol grip
Solution Approach 1:
The pistol grip feature is extracted from the weapon configuration to achieve legislative compliance. By removing the conventional pistol grip while retaining the detachable magazine, the weapon configuration is adjusted to meet legal requirements while preserving the desired magazine adaptability.
Data Source
AI summary
An AR-type rifle lower receiver comprises a lower portion having a supplemental opening or recess adjacent the rifle's trigger-guard opening for receiving the middle finger of the user's hand. In addition, a juxtaposed curved boundary surface spaced laterally and rearwardly with respect to the supplemental opening is provided to define a comfortable “grip” bearing surface for the area between the thumb and index finger of the user's hand when the user positions his/her index finger on the rifle's trigger.