Buffer Tower Cut-Out Extends Bolt Travel
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Solution Overview
Problem
Rifles face challenges in extending bolt travel, which affects the reliability of round stripping and feeding, and increases recoil, making it difficult to determine if the last round has been discharged and complicating reloading.
Innovation Solution
Incorporating a buffer tower with a cut-out in the lower receiver that extends the bolt travel by allowing the bolt to engage further with the buffer tower, increasing the cycle time and reducing recoil.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If bolt travel is extended to improve round stripping and feeding reliability, then reliability is improved, but recoil increases
Solution Approach 1:
The buffer tower is segmented with a cut-out portion that divides the bolt travel path into distinct segments. The bolt travels through the cut-out space, allowing extended travel distance without requiring a proportionally larger overall buffer tower structure. This segmentation enables the bolt to achieve greater travel for improved stripping and feeding reliability while the modular design manages the recoil impulse more effectively.
Solution Approach 2:
The cut-out in the buffer tower creates a three-dimensional travel path that allows the bolt to move through a complex trajectory rather than a simple linear path. This dimensional change enables extended bolt travel in multiple directions, improving reliability of round stripping and feeding while distributing the recoil forces across different spatial dimensions, thereby reducing the perceived recoil impact.
2Loss of time
If bolt travel is extended to provide additional time for bolt catch movement, then time is improved, but device complexity increases
Solution Approach 1:
The buffer tower with the cut-out serves multiple functions simultaneously: it extends bolt travel time for improved catch movement, maintains structural integrity of the lower receiver, and provides a space-efficient design that doesn't significantly increase overall device complexity. The same structural element (buffer tower) accomplishes both time extension and structural support, avoiding the need for separate components.
Solution Approach 2:
Rather than uniformly increasing the size or complexity of the entire buffer tower structure, the cut-out is strategically placed in a specific local region to achieve the desired bolt travel extension. This localized modification provides the necessary additional time for bolt catch movement while minimizing the increase in overall device complexity, as only a portion of the buffer tower is modified.
3Reliability
If bolt travel is extended to improve suppressor functionality, then suppressor performance is improved, but manufacturing complexity increases
Solution Approach 1:
The cut-out feature is integrated directly into the buffer tower structure, merging the bolt travel extension function with the existing buffer tower component. This consolidation allows the suppressor functionality improvement to be achieved through a single manufactured part rather than requiring separate assemblies, thereby reducing manufacturing complexity despite the extended bolt travel requirements.
Solution Approach 2:
The invention modifies the geometric parameters of the buffer tower by introducing a cut-out, which changes the physical dimensions and shape of the component. This parameter change enables extended bolt travel for improved suppressor functionality while the cut-out geometry can be optimized during manufacturing to facilitate production, balancing the enhanced performance with manufacturing ease.
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
This solution enhances the reliability of round stripping and feeding, provides additional time for the bolt catch to move upwards, and reduces recoil, improving user experience and suppressor functionality.
Implementation Method 1
The cut-out extends the travel of the bolt along the length of the rifle as the bolt cycles backward toward the stock
Implementation Method 2
Using a portion of expanding gas from ignition of the charge, a bolt carrier group is directed toward a rear end of the firearm
Data Source
AI summary
A buffer tower for a rifle includes a cut-out on an upper end thereof. The cut-out extends a travel length of the bolt during bolt action. The cut-out extends the travel length by greater than 10 mm. This extended travel length reduces the felt recoil of the rifle and increases the cycle time. An increased cycle time improves feeding reliability from the magazine.