Fixed-Barrel Receiver Venting for Over-Pressure Firearm Safety
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Solution Overview
Problem
Existing firearms, such as AR15, M16, and M4 type rifles, suffer from issues like firearm fouling due to combustion gas deposits, venting of gases into the operator's face, and potential over-pressure events causing damage to the receiver, while lacking belt-feed capability and fixed barrel accuracy.
Innovation Solution
A firearm receiver system with a gas piston energizing arrangement, built-in over-pressure relief, and belt-feed capability, featuring a fixed barrel and integrated pressure relief passages to manage combustion gases and prevent receiver damage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If direct-gas impingement system is used to energize bolt carrier group, then firearm structure is simplified and weight is reduced, but combustion gas deposits foul the receiver and are vented into operator's face
Solution Approach 1:
The system separates the gas energizing function from the receiver interior by introducing a gas piston and cylinder arrangement. The combustion gas acts on the piston in a dedicated cylinder, which then transfers energy to the bolt carrier group through a rod, keeping the receiver interior free of direct gas contact and deposits.
Solution Approach 2:
The gas piston and cylinder act as an intermediary between the combustion gas and the bolt carrier group. Instead of gas directly impinging on the bolt carrier in the receiver, the piston-cylinder-rod mechanism mediates the energy transfer, preventing gas deposits from fouling the receiver while still providing the necessary energizing force.
2Measurement precision
If fixed barrel arrangement is used, then accuracy is improved, but mission flexibility and heat mitigation are reduced compared to quick-change barrels
Solution Approach 1:
The system employs a selective fire mode mechanism that dynamically changes the barrel configuration based on operational requirements. In semi-automatic mode, the fixed barrel provides maximum accuracy, while in automatic mode, the quick-change barrel capability allows for rapid barrel replacement to mitigate heat and adapt to different missions, combining the advantages of both fixed and quick-change barrel systems.
3Productivity
If belt-feed capability is added to automatic firearms, then ammunition delivery capacity is increased, but device complexity and weight are increased
Solution Approach 1:
The receiver assembly is designed with universal feed capability that can accommodate both belt-fed and magazine-fed ammunition systems. This multi-functional design allows the same basic receiver structure to support different ammunition delivery methods, increasing versatility without requiring completely separate systems for each feed type.
4Reliability
If pressure relief passages are added to prevent over-pressure damage, then receiver safety is improved, but device complexity increases
Solution Approach 1:
The pressure relief passages are pre-configured in the receiver assembly to automatically activate when over-pressure conditions occur. These passages provide a predetermined escape route for combustion gases, preventing dangerous pressure buildup without requiring active control systems or complex mechanisms - the relief action is built into the structure itself and activates automatically when needed.
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 system reduces fouling, enhances operator safety, maintains accuracy, and prevents receiver damage during over-pressure events, while enabling high-capacity ammunition delivery through belt-feed.
Implementation Method 1
The combustion gas produced during firing of a round of ammunition generate energy that acts upon a tappet style pusher rod to bias the bolt carrier group into a recoil stroke
Implementation Method 2
The combustion gas produced during firing of a round of ammunition generate energy
Implementation Method 3
The pressure relief body enables at least a portion of the combustion gas to escape from within the receiver through the pressure relief passage when the combustion gas exerts pressure on the pressure relief body that is at or above the prescribed relief passage pressure
Data Source
AI summary
A firearm receiver system comprises a receiver and a handguard. The receiver includes a front mounting body and a central bore configured for having a bolt carrier slidably disposed therein. The central bore includes a barrel-receiving receptacle at least partially located within the front mounting body. The handguard includes a handguard mounting body receptacle at a first end portion thereof. The front mounting body includes a plurality of interior surfaces each matingly engaged with a corresponding one of a plurality of exterior surfaces of the handguard mounting body receptacle. The receiver and the handguard may unitarily-formed body. The receiver may be configured for accommodating a barrel extension. The front mounting body may be configured for providing a fixed-barrel receiver system. The receiver may accommodate a pressure relief body for enabling the receiver to exhibit pressure relief functionality in the event of an over-pressure event within the receiver.