Trigger Guard Tool for AR-15 Roll Pin Extraction
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing tools for removing and replacing roll pins in firearms, such as the AR-15 rifle, often apply excessive force, leading to stress and potential damage or bending of the trigger guard and surrounding structures, due to oblique and lateral forces during the removal process, which can compromise the firearm's functionality.
Innovation Solution
A device featuring a cylindrical platform with a contoured top section that engages the lower receiver's pistol grip and includes a roll pin receiving port to stabilize the firearm and support the trigger guard during roll pin removal and insertion, minimizing the risk of damage by providing a stable and frictional engagement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If a roll pin punch tool is used to remove the roll pin, then the roll pin can be dislodged from the bore hole, but oblique and lateral forces are applied to the trigger guard assembly causing stress and potential damage
Solution Approach 1:
The device introduces a lower receiver support as an intermediary component between the operator and the trigger guard assembly. This support absorbs and redirects forces, preventing oblique and lateral forces from being transmitted to the trigger guard assembly during roll pin removal, thereby eliminating the harmful stress while maintaining effective force application to the roll pin.
Solution Approach 2:
The lower receiver support acts as a counterbalancing structure that provides reactive support during roll pin removal. By positioning the support to engage complementary surfaces of the lower receiver, it creates a stable reference frame that counteracts the forces applied during pin removal, preventing force transmission to vulnerable trigger guard components.
2Productivity
If pressure and tapping are applied to the roll pin punch to dislodge the pin, then the pin is removed, but the trigger guard assembly experiences lateral forces that can cause warping and breakage
Solution Approach 1:
The lower receiver support serves as a mediator that decouples the force application process from the trigger guard assembly. It provides a stable platform for applying removal forces while preventing these forces from being transmitted to the trigger guard, thus maintaining both removal efficiency and structural integrity.
Solution Approach 2:
The device provides beforehand cushioning by establishing a stable support configuration before force application begins. The lower receiver support is positioned to engage complementary surfaces in advance, creating a protective framework that cushions against lateral forces and prevents warping or breakage during the pin removal process.
3Stability of the object's composition
If conventional clamps and vice-like devices are used to hold the lower receiver, then the receiver is secured, but they only clamp a portion and do not support susceptible sections like the trigger guard
Solution Approach 1:
The lower receiver support is designed with multi-functionality, serving both to secure the lower receiver in a stable position and to specifically support susceptible sections like the trigger guard assembly. By engaging multiple complementary surfaces simultaneously, it provides comprehensive protection while maintaining receiver stability, eliminating the need for separate support devices.
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
The device ensures damage-free removal and replacement of roll pins by maintaining the firearm's stability and reducing excessive force on the trigger guard and pin joints, thereby preventing bending or breakage and ensuring proper alignment and functionality.
Implementation Method 1
The pistol grip mating region services to engage the lower receiver pistol grip area of a firearm to be serviced and hold the lower receiver in a fixed and stable position by means of the complementary frictional and interferential engagement of its surface with the contoured surfaces of the gunner's platform.
Data Source
AI summary
A tool providing a means to safely extract and/or insert a roll pin from the trigger guard assembly of a lower receiver unit of an automatic or semiautomatic rifle. Current tools fail to provide positive engagement and support of the trigger guard region, particularly the trigger guard lips which can easily be snapped or fractured during a roll pin extraction or insertion process. Accordingly, the present disclosure provides an improved means to align and support a lower receiver unit by means of complementary mating and stop regions that secure the lower receiver in position while providing one or more cutouts that accommodate protruding levers and buttons on the lower receiver. Some embodiments feature a contoured top section having at least one of a plurality of surface features selected from a cutout, a mating region and a stop region; and a roll pin receiving port.