Straight-Cut Firearm Barrel for Spin-Free Projectile Stability
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Solution Overview
Problem
Existing firearms with short barrels are subject to regulations due to their classification as rifles or shotguns, and barrels with straight cut lands and grooves have been obsolete, limiting their use in modern firearms.
Innovation Solution
A firearm barrel design featuring straight cut lands and grooves that prevent projectile spin, allowing for a short-barreled firearm that avoids regulatory classification and maintains accuracy and velocity, using fin-stabilized projectiles and sabot assemblies.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a barrel with straight cut lands and grooves is used, then the firearm can be classified outside NFA regulations, but the projectile velocity and accuracy are reduced compared to rifled barrels
Solution Approach 1:
The patent changes the geometric parameters of the barrel interior by using straight cut lands and grooves instead of spiral rifling. This parameter change fundamentally alters how the barrel interacts with the projectile, eliminating spin while maintaining sufficient accuracy for the intended use case and enabling regulatory avoidance.
Solution Approach 2:
Instead of using traditional spiral rifling to stabilize the projectile through spin, the patent inverts the approach by using straight cuts that prevent spin and rely on alternative stabilization methods (such as fin stabilization or sabot assemblies) to achieve accuracy.
2Stability of the object's composition
If a barrel with straight cut lands and grooves is used, then the wads do not spin and shot column moves forward with less dispersion, but the design has been obsolete and never used with modern breech-loading metallic cartridges
Solution Approach 1:
The patent makes the straight cut barrel design universally applicable to modern breech-loading metallic cartridges by integrating it with contemporary cartridge systems. The design serves multiple functions: it provides shot column stability like traditional straight cut barrels, while also being compatible with modern ammunition types and regulatory requirements.
Solution Approach 2:
The patent employs composite stabilization approaches combining straight cut lands and grooves with fin-stabilized projectiles and/or sabot assemblies. This composite system integrates the stability benefits of straight cuts with the compatibility of modern cartridge systems, creating a hybrid solution that bridges historical design with modern requirements.
3Ease of operation
If a short barrel is used for interior home defense, then the firearm is easier to maneuver and less likely to snag, but the firearm becomes subject to NFA registration requirements
Solution Approach 1:
The patent changes the barrel geometry parameter from traditional rifled or smoothbore to straight cut lands and grooves. This parameter change creates a unique classification that falls outside NFA regulations while maintaining the short barrel length needed for maneuverability in close quarters defense applications.
Data Source
AI summary
A firearm barrel has an elongated body defining a bore and defining a bore axis, the body defining a breech end and an opposed muzzle end, a chamber defined in the breech end and contiguous with the bore; the bore having an interior surface having a plurality of alternating lands and grooves, the grooves being surfaces separated from the bore axis by first radius, the lands being surfaces separated from the bore axis by second radius less than the first radius and the lands and grooves being straight elements parallel to the bore axis, such that no spin is imparted to a projectile propelled down the bore. The lands and grooves may extend from the chamber to the muzzle end. The bore may have a constant cross-sectional profile along its length.