Integral Barrel Nut Suppressor for AR15 Length Compliance
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Solution Overview
Problem
AR15-pattern firearms with short barrels and integral suppressors face regulatory issues under federal law, requiring two tax stamps for transfer, and accumulate unburned powder in suppressor baffles, especially in pistol caliber configurations.
Innovation Solution
An integral firearm sound suppressor design where the barrel nut is integrally formed with the suppressor housing, supporting the barrel in tension, with a baffle tube and ports to manage pressure waves and unburned powder, ensuring the overall length meets legal requirements and reduces noise.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of moving object
If a short barrel is used in pistol caliber configuration, then the firearm becomes more compact and maneuverable, but it requires two NFA tax stamps for transfer when combined with an integral suppressor
Solution Approach 1:
The suppressor and barrel nut are merged into a single integral component, creating an integrated assembly that functions as both a suppressor and a barrel mounting mechanism. This merging eliminates the need for separate suppressor and barrel nut components, thereby reducing regulatory classification complexity while maintaining the short barrel configuration.
Solution Approach 2:
The integral suppressor assembly serves multiple functions: it acts as a sound suppressor, a barrel nut for securing the barrel to the receiver, and a structural support for the barrel. This multi-functionality consolidates what would traditionally be separate components into one universal element, simplifying regulatory classification.
2Length of moving object
If a short barrel with integral suppressor is used, then the overall firearm length is reduced, but unburned powder accumulates in the suppressor baffles
Solution Approach 1:
A dedicated powder extraction port is provided in the integral suppressor assembly, allowing unburned powder and debris to be removed from the suppressor interior. This extraction mechanism directly addresses the harmful accumulation of unburned powder in the baffles while maintaining the compact short barrel configuration.
Solution Approach 2:
The suppressor design incorporates features that facilitate the discarding of unburned powder and debris through the extraction port. By providing a dedicated egress path for expelled materials, the system enables regular cleaning and maintenance to prevent harmful accumulations in the compact suppressor chamber.
3Device complexity
If the barrel nut is made integral with the suppressor housing, then the number of parts is reduced and assembly is simplified, but the barrel must be supported in tension
Solution Approach 1:
The barrel nut and suppressor housing are merged into a single integral component, eliminating the need for separate barrel nut and suppressor parts. This merging reduces the total number of parts and simplifies assembly while the integral structure is designed to handle barrel tension forces through its unified construction.
Solution Approach 2:
The integral suppressor assembly is constructed from materials and structural designs that provide both the necessary mechanical strength to support barrel tension forces and the acoustic properties required for sound suppression. The composite structure integrates structural support functions with acoustic attenuation functions in a single component.
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 design avoids the need for separate tax stamps by meeting legal length requirements and effectively reduces noise by managing pressure waves and unburned powder accumulation.
Implementation Method 1
supporting the barrel in tension and attach the barrel to the upper receiver with a barrel nut
Implementation Method 2
cause multiple interfering pressure waves to form in the first chamber when a projectile is fired
Implementation Method 3
effectively reduces noise by managing pressure waves and unburned powder accumulation
Data Source
AI summary
Disclosed is an integral firearm sound suppressor, comprising a barrel, a first tube, and interior connector, a baffle tube, and at least one baffle. The barrel has an axial bore, a chamber end, and a muzzle end. The chamber end is attachable to a receiver by the barrel nut. The first tube extends forwardly of the barrel nut to define an annular first chamber at least partially surrounding the barrel and having a closed forward end. The barrel has at least one port providing fluid communication between the bore and the first chamber. The interior connector supports the muzzle end of the barrel. The baffle tube extends forwardly of the muzzle end of the barrel and has a forward end wall defining an exit opening. The at least one baffle is positioned in the baffle tube and spaced forward of the muzzle end of the barrel.