Suppressor First Round Pop Reduction via Gas Displacement
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Solution Overview
Problem
The initial shot fired through a sound suppressor often produces a louder noise due to hot muzzle gases burning in residual air, known as 'first round pop' (FRP), which is unsafe and inconvenient to address with existing methods.
Innovation Solution
A valve system is introduced to connect a source of compressed non-flammable gas, such as CO2, to the baffled interior space of the suppressor, allowing safe and convenient displacement of residual air, reducing the combustion of oxygen during the first shot.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a user manually injects non-flammable gas into the suppressor to displace residual air, then the first round pop noise is reduced, but the operation becomes unsafe and inconvenient due to hand proximity to the muzzle
Solution Approach 1:
A valve system is introduced as an intermediary component between the gas source and the suppressor interior. The valve includes a valve body with a valve seat, a valve member that movable engages with the valve seat to control gas flow, and a biasing mechanism. This intermediary device allows automatic gas injection without requiring the user to place hands near the muzzle, thereby resolving the safety and convenience issue while still achieving displacement of residual air to reduce first round pop noise.
Solution Approach 2:
The valve system is designed to automatically control the injection of non-flammable gas into the suppressor. The valve member responds to pressure differential across the valve seat and the biasing mechanism to open and close the gas flow path without manual intervention. This self-service mechanism eliminates the need for unsafe manual operation while maintaining the noise reduction benefit.
2Ease of operation
If a valve system with movable valve member and biasing mechanism is introduced, then safe and convenient gas injection is achieved, but the device complexity increases
Solution Approach 1:
The valve system is designed as a modular assembly that can be attached to the suppressor rather than being integrated into the suppressor body itself. The valve body, valve member, and biasing mechanism are presented as separable components that can be installed and removed independently. This extraction approach allows the complex valve functionality to be added without permanently complicating the suppressor structure, maintaining ease of maintenance and replacement.
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 solution effectively reduces the noise level by displacing residual air with non-flammable gas, providing a safer and more convenient method to mitigate the 'first round pop' issue, with noticeable sound reductions and improved muzzle velocity consistency.
Implementation Method 1
The valve can be selectively actuated by the user to introduce the non-flammable gas, causing this gas to displace residual air in the interior of the suppressor
Implementation Method 2
The valve acts to allow passage of gas from the valve first end into the baffled interior space via the valve second end when a source of compressed gas is connected to the valve first end, and acts to block passage of gases therethrough when no source of compressed gas is connected to the valve first end
Data Source
AI summary
First round shot noise and flash caused by combustion of oxygen contained in the air residing in a firearm sound suppresser can be reduced by providing a valve that communicates with the baffled interior space of the suppressor, and connecting a source of non-flammable gas such as CO2 to the valve in order to inject the gas into the suppressor. The non-flammable gas displaces the air in the suppressor, removing the oxygen available for combustion when the first shot is fired.