Removable Barrel Locking for Repeatable Takedown Firearm Accuracy
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Solution Overview
Problem
Takedown firearms with detachable barrels face challenges in achieving precise chamber space definition, repeatability, and harmonics stability, often requiring complex adjustments and additional parts, which can compromise safety and accuracy.
Innovation Solution
A takedown firearm design that secures the barrel to the receiver with a locking stud and detent plunger system, providing passive tensioning without adjustments, ensuring precise positioning and harmonics stability through a 'underspaced' chamber arrangement, eliminating the need for barrel extensions and non-tensioned connections.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the barrel is rigidly secured to the receiver by high-retention methods (threaded locknut or press fit pins), then the accuracy of the firearm is improved, but the ability to quickly disassemble and reassemble is lost
Solution Approach 1:
The barrel is divided into two separate components: a receiver portion and a barrel portion, which can be easily separated from each other. This segmentation allows the barrel to be quickly detached and reattached without requiring complex disassembly tools or procedures, while still maintaining accurate alignment through the alignment features integrated into the receiver portion.
Solution Approach 2:
The alignment features (such as alignment pins, recesses, or guide surfaces) integrated into the receiver portion act as intermediaries that ensure precise positioning of the barrel during assembly. These features mediate between the need for quick assembly and the requirement for high accuracy by automatically guiding the barrel into the correct position without requiring complex adjustment procedures.
2Manufacturing precision
If a barrel extension is added to maintain chamber space in a fixed relationship during disassembly, then chamber space definition is improved, but device complexity increases due to additional parts and manufacturing integration
Solution Approach 1:
The chamber space definition features are merged directly into the receiver portion of the barrel, eliminating the need for a separate barrel extension component. The receiver portion is designed with integrated features (such as recesses, guides, or positioning surfaces) that maintain the correct chamber space relationship during both assembled and disassembled states, thereby reducing overall device complexity while preserving precision.
3Productivity
If the barrel position is not set to within adequate tolerances, then assembly speed is improved, but cartridge rupture safety concerns arise
Solution Approach 1:
The alignment features in the receiver portion are designed to self-align the barrel during assembly, automatically positioning it within adequate tolerances without requiring complex adjustment procedures or specialized tools. The self-aligning mechanism (through geometric constraints, guide surfaces, or interference fits) ensures that even rapid assembly maintains safety standards by preventing excessive misalignment that could cause cartridge rupture.
Data Source
AI summary
A takedown firearm that may utilize removable barrels of different calibers. The disclosed firearm does not require a barrel extension, instead providing positioning of the barrel that is sufficiently precise and repeatable. Tensioning of the barrel is provided passively during installation of the removable barrel, without need for adjustment or additional tightening. Securing the removable barrel to the receiver does not structurally involve the fore end, thereby avoiding harmonics effects associated with fore end interfaces to the receiver. The firearm takes advantage of an “underspaced” chamber arrangement to provide additional tolerance for manufacturing and assembly of the firearm.