Gas Buffer Plenum for Consistent Gas Cycling in Automatic Firearms
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Solution Overview
Problem
Current automatic gas-operated firearms suffer from inconsistencies in bullet path, reduced accuracy due to vibration, inconsistent gas pressure, unburnt powder fouling, and varying gas force issues, which affect cycling reliability and require adjustable gas blocks.
Innovation Solution
A gas buffer plenum is positioned at the end of the barrel, eliminating the need for a vertical port hole, allowing the bullet to leave the rifling before gas is directed to the receiver, ensuring consistent gas pressure and reducing fouling, with multiple chambers to store and apply pressure consistently.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a vertical port hole is drilled into the barrel to allow gas to escape into a gas block, then gas can be directed to cycle the bolt, but this creates inconsistency in the bullet path causing vibration and degrading accuracy
Solution Approach 1:
The gas port hole is extracted from the barrel and relocated to the buffer plenum chamber at the muzzle end. This removes the source of bullet path inconsistency from the barrel itself, eliminating vibration caused by gas escape during bullet travel while preserving gas extraction for bolt cycling through the plenum chamber's port hole
Solution Approach 2:
The buffer plenum chamber serves as an intermediary component between the barrel and the gas tube. It captures high-pressure gas after the bullet passes, allowing gas to be directed to the bolt without interfering with the bullet's path through the barrel, thus mediating between the need for reliable cycling and accurate bullet flight
2Reliability
If gas is pulled from the barrel to cycle the bolt while the bullet is still in contact with the rifling, then the bolt can be cycled, but this generates reduced and inconsistent gas pressure on the bullet reducing velocity and accuracy
Solution Approach 1:
The buffer plenum chamber is positioned to capture gas after the bullet has already passed through the rifling zone. This preliminary positioning ensures that gas pressure is maintained on the bullet during its entire acceleration phase, with gas extraction occurring only after the bullet leaves the rifling, thus preserving maximum velocity and consistency
3Reliability
If the vertical port hole is located at the midpoint of the barrel, then gas can be extracted to cycle the bolt, but the powder is not completely burned up and unburnt powder enters the gas tube and receiver causing fouling
Solution Approach 1:
The gas extraction location is moved from the longitudinal midpoint of the barrel to the muzzle-end buffer plenum chamber, changing the spatial dimension of gas capture. This allows the system to extract gas after the bullet has traveled the full length of the barrel, ensuring complete powder combustion before gas enters the plenum and is directed to the bolt, thereby eliminating unburnt powder fouling
4Device complexity
If the port hole size and position are fixed, then the gas block structure is simple, but the gas forces on the bolt vary greatly depending on barrel length and round type requiring adjustable gas blocks
Solution Approach 1:
The buffer plenum chamber serves multiple functions: it acts as a gas capture chamber, a pressure buffer, and a transition chamber for different barrel lengths and round types. The enlarged chamber volume provides a universal solution that accommodates varying gas pressures and volumes from different ammunition types and barrel configurations without requiring adjustable components
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
This solution enhances accuracy and velocity consistency, reduces fouling, and improves cycling reliability across different rounds and barrel lengths, comparable to bolt-action firearms, while minimizing the need for frequent cleaning.
Implementation Method 1
the gas forces on the bolt vary greatly depending on port hole size, port hole position, and the length of the barrel
Implementation Method 2
The multiple chambers store pressure that is consistently applied into the gas tube and to the bolt as the bullet passes through the chambers
Data Source
AI summary
A gas tube support system for a gas-actuated firearm contains an annular or bored housing for receipt of a gas tube therein, thereby securing the gas tube during operation of the firearm. At least one or more bores are drilled or formed within the annular or bored housing to provide an impingement of the gas tube as it extends through the annular or bored housing. One or more fasteners are threadedly or otherwise received within a corresponding one of one or more respective bores, thereby securing the gas tube within the annular or bored housing. A gas-actuated firearm containing the gas tube support system is also provided.