Two-Piece Barrel Nut Segmentation for Accuracy
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Solution Overview
Problem
Existing barrel nuts for AR-15 and AR-10 rifles often reduce accuracy due to contact with the barrel, either through mounting systems or set screws, which deform the internal nut and affect the barrel's integrity.
Innovation Solution
A two-piece barrel nut design featuring an internal nut with a scalloped edge and an external nut with offset screw holes allows for precise alignment and locking without direct contact, providing 7.5° rotational adjustability and threaded holes for a floating front grip, ensuring the barrel does not contact the nut or grip along its length.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If set screws or mounting systems are used to secure the barrel nut, then the barrel nut can be locked in position, but the barrel contacts the nut which deforms the internal nut and reduces accuracy
Solution Approach 1:
The barrel nut is divided into two separate pieces: an internal nut that threads onto the barrel and an external nut that locks to the internal nut. This segmentation allows the internal nut to remain free of contact with set screws, preserving its integrity and the barrel's accuracy, while the external nut provides the necessary locking function through engageable members that do not contact the barrel.
2Device complexity
If a single-piece barrel nut is used, then the structure is simple, but it cannot provide both locking function and prevent barrel contact
Solution Approach 1:
The barrel nut is divided into two separate pieces: an internal nut that threads onto the barrel and an external nut that locks to the internal nut. This segmentation allows the internal nut to remain free of contact with set screws, preserving its integrity and the barrel's accuracy, while the external nut provides the necessary locking function through engageable members that do not contact the barrel.
Solution Approach 2:
The external nut acts as an intermediary that provides the locking function without directly contacting the barrel. It engages with the engageable members on the internal nut to secure the assembly, thereby preventing set screws or mounting systems from deforming the internal nut while still achieving reliable locking.
3Strength
If the internal nut is deformed by contact, then the locking mechanism is secure, but the barrel integrity is compromised
Solution Approach 1:
The barrel nut is divided into two separate pieces: an internal nut that threads onto the barrel and an external nut that locks to the internal nut. This segmentation allows the internal nut to remain free of contact with set screws, preserving its integrity and the barrel's accuracy, while the external nut provides the necessary locking function through engageable members that do not contact the barrel.
Solution Approach 2:
The external nut acts as an intermediary that provides the locking function without directly contacting the barrel. It engages with the engageable members on the internal nut to secure the assembly, thereby preventing set screws or mounting systems from deforming the internal nut while still achieving reliable locking.
Data Source
AI summary
A two-piece barrel nut includes an internal nut with an externally threaded portion on one end and a plurality of engageable members on the opposite end, and an external nut with an internally threaded portion on one end that receives the externally threaded portion of the internal nut and one or more receptacles on the other end that each may receive a fastener that engages at least one of the plurality of engageable members on the internal nut to lock the external nut to the internal nut. A method for using the barrel nut to attach a barrel to a firearm is also disclosed.