Firearm Integrally Formed Upper Receiver Rail Design
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Solution Overview
Problem
Current firearms face challenges such as complex assembly processes, reliability issues under harsh conditions, mechanical failures due to water or squib rounds, inconsistent ejection patterns, and difficulties in switching between calibers, which can compromise user safety and efficiency.
Innovation Solution
A firearm design featuring a two-piece receiver with an integrally formed upper receiver and internal rail, a polymer spring for the extractor, and adjustable ejection buffer, allowing for quick caliber changes and reliable operation in harsh environments, with features like a beveled barrel retention recess and anti-bounce mechanism to prevent mechanical failures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If traditional welding or mechanical fastening methods are used to attach rails to the receiver, then the firearm can be assembled, but the assembly process becomes complex and time-consuming
Solution Approach 1:
The rail is integrated directly into the receiver as a single monolithic structure, eliminating the need for separate attachment processes. The receiver and rail are manufactured together as one piece, removing welding or mechanical fastening steps entirely.
Solution Approach 2:
The receiver serves dual functions: it houses the firing mechanism and simultaneously provides the structural rail for attaching accessories. This multi-functional design eliminates the need for separate rail components and their associated assembly procedures.
2Adaptability or versatility
If the ejection port is made large to accommodate different calibers, then caliber versatility is improved, but spent cartridges are ejected in a random pattern causing loss and user frustration
Solution Approach 1:
The ejection buffer is made adjustable, allowing it to be repositioned for different caliber configurations. This dynamic adjustment capability enables the system to maintain consistent ejection patterns while accommodating various cartridge sizes and weights.
Solution Approach 2:
The position of the ejection buffer can be changed to optimize ejection angles for different calibers. By adjusting this parameter, the system maintains reliable lateral ejection patterns regardless of which caliber is being fired.
3Device complexity
If the same ejector position is used for all calibers, then the firearm structure is simplified, but ejection reliability deteriorates for certain calibers
Solution Approach 1:
The ejector system incorporates adjustability, allowing the ejection buffer to be repositioned based on the specific caliber being used. This transforms a static, one-size-fits-all approach into a dynamic system that adapts to different operational requirements.
4Ease of manufacture
If the firearm uses traditional extractor springs, then the design is conventional, but the extractor may fail under harsh conditions or when fouling accumulates
Solution Approach 1:
The extractor spring is designed as a polymer component that can be easily replaced. While individual springs may have limited service life under harsh conditions, their low cost and ease of replacement ensure continuous reliability without complex maintenance procedures.
5Manufacturing precision
If the firearm is designed for single caliber, then manufacturing precision is improved, but adaptability to different calibers is reduced
Solution Approach 1:
The firearm is divided into modular components (barrel, receiver, bolt) that can be independently configured for different calibers. This segmentation allows each component to be optimized for specific caliber requirements while maintaining overall system versatility.
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 enhances reliability, reduces assembly time and costs, ensures consistent ejection, and maintains operational integrity under adverse conditions, while allowing for efficient caliber changes and minimizing the risk of mechanical failure.
Implementation Method 1
a polymer spring that biases the sliding extractor against the base of the cartridge to retain the base of the cartridge against the bolt face
Implementation Method 2
The upper receiver may include a barrel retention feature that allows the barrel attachment device to be disposed in the barrel retention feature so that the tapered end engages the beveled barrel retention recess to attach the barrel to the upper receiver
Data Source
AI summary
A firearm including a barrel having a chamber and an integrally formed upper receiver having a passageway, an accessory rail extending the complete length of the upper receiver, and a guidance feature extending along the passageway. The firearm also includes an operating rod having an anti-bounce mechanism, a bolt that is rotated counter-clockwise to lock against the chamber, a bolt carrier having a safety extension disposed below the bolt that prevents a hammer from striking a firing pin until the bolt is locked against the chamber, a lower receiver, a recoil spring assembly, and a fire control group. The bolt includes a polymer spring that biases a sliding extractor against the base of a cartridge. The sliding extractor is disposed at an angle ranging from thirty degrees to fifteen degrees on the bolt face to provide a low ejection angle from the firearm.