Bolt Carrier Gas Venting to Keep Debris Out of the Shooter’s View
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Solution Overview
Problem
Semi-automatic firearms, such as AR-15 and AR-10 rifles, suffer from gas escaping through side holes on the bolt carrier, causing debris to irritate the user and obstruct their view.
Innovation Solution
A bolt carrier design with downward-facing gas passages and exit apertures that redirect gas away from the user, eliminating side holes and redirecting gas downward or through emergency relief ports.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-generated harmful factors
If side gas holes are present on the bolt carrier, then gas can escape during operation, but debris is carried towards the user causing irritation and obstruction of field of view
Solution Approach 1:
The patent inverts the traditional side-facing gas hole configuration by orienting the gas passage downward. The gas passage extends from the bore in a downward direction rather than laterally, causing gas and debris to exit away from the user's face and field of view. This directional inversion resolves the contradiction by maintaining gas escape functionality while eliminating the harmful effect of debris being carried toward the user.
Solution Approach 2:
The patent transitions the gas escape path from a lateral (horizontal) dimension to a vertical dimension. Instead of gas exiting through side holes that project debris horizontally toward the user, the gas passage directs flow vertically downward through the bottom of the bolt carrier. This dimensional change redirects the harmful flow away from the user while preserving the pressure relief function.
2Object-affected harmful factors
If downward-facing gas passages are implemented, then debris is directed away from the user, but the gas passage structure becomes more complex
Solution Approach 1:
The patent merges the gas passage function with the existing bolt carrier body structure. Rather than adding a separate gas directing mechanism, the gas passage is integrated directly into the bolt carrier, extending from the bore through the carrier body. This integration achieves the harmful factor mitigation while minimizing structural complexity by combining multiple functions into a single unified component.
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
Prevents debris from reaching the user and maintains a clear field of view by channeling gas away from the operator, enhancing user safety and operational efficiency.
Implementation Method 1
gas generated by a discharged round of ammunition returning from the barrel via a gas tube and acting upon a carrier key attached to the bolt carrier
Implementation Method 2
gas rings on the bolt residing within the bolt carrier pass the front of these two holes, allowing gas to escape to the outside of the receiver
Data Source
AI summary
A bolt carrier assembly having a bolt carrier with at least one gas exit hole located at the bottom of the bolt carrier so as to allow the passage of gas generated from a discharged round of ammunition downward into the magazine and magazine well of a firearm, away from the user.