Direct Impingement Bolt Locking Lug Gas Actuation
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Solution Overview
Problem
M16-type rifles with direct impingement gas-operation systems face issues with fouling and misfires due to direct gas action on the bolt, leading to unreliable operation, especially in adverse conditions, and previous solutions have been inadequate in terms of simplicity, cost, and effectiveness.
Innovation Solution
A longitudinally translatable bolt with a rearward locking mechanism featuring a locking lug and reinforcement, which shifts between locked and unlocked positions via gas means, integrated with a bolt having an extractor and alignment features to maintain rotational alignment, allowing for reliable operation and reduced debris accumulation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If direct impingement gas-operation system is used, then device complexity and weight are reduced, but reliability deteriorates due to fouling and misfires
Solution Approach 1:
The gas-operating system is segmented into separate functional components: a gas key for gas entry, a locking mechanism with locking lugs for bolt securing, and a buffer system for recoil management. This segmentation allows each component to be optimized independently, reducing fouling in critical areas while maintaining system simplicity.
Solution Approach 2:
A gas key is introduced as an intermediary component between the barrel port and the bolt carrier. This gas key directs gas flow to actuate the locking mechanism without requiring direct gas contact with the bolt, thereby reducing fouling while maintaining the simplicity of direct impingement operation.
2Reliability
If locking mechanism with multiple components is used, then reliability is improved, but device complexity increases
Solution Approach 1:
The locking mechanism merges multiple functions into integrated components: the bolt carrier incorporates locking lugs directly into its structure, the buffer is integrated into the stock, and the gas key combines gas directing with locking actuation. This merging reduces the number of separate parts while maintaining reliable locking functionality.
Solution Approach 2:
The bolt carrier serves multiple functions: it acts as the moving component for chambering rounds, incorporates locking lugs for securing the bolt, and integrates the buffer for recoil management. This multi-functionality reduces overall system complexity while maintaining reliability through fewer potential failure points.
3Object-affected harmful factors
If chrome plating is applied to bolt and bolt carrier, then resistance to debris build-up is improved, but manufacturing cost and complexity increase
Solution Approach 1:
The harmful effect of direct gas contact causing fouling is extracted and isolated to specific areas (barrel port and gas key) rather than requiring protective coatings on entire components. This allows use of simpler, less expensive materials and finishing processes on the bolt and bolt carrier while still achieving debris resistance where 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 solution enhances the reliability and simplicity of the gas-operating system by reducing fouling and misfires, ensuring consistent operation in adverse conditions, and allows for manual assistance in case of locking mechanism failure, maintaining alignment and stability during firing.
Implementation Method 1
Once the gas enters the bolt carrier, it expands, and the pressure from the gas urges the bolt carrier away from the barrel
Data Source
AI summary
The present invention is a direct impingement gas operated firearm, having a longitudinally translatable bolt and a rearward locking mechanism coupled to the bolt. The rearward locking mechanism includes a locking lug, laterally shiftable by gas means from a locked position to an unlocked position, and a reinforcement, fixed with respect to the bolt. In the locked position the lug interferes with the reinforcement such that the bolt is restrained from moving longitudinally, and in the unlocked position the bolt is free to longitudinally translate within the firearm.