Captured Spring Recoil Buffer Assembly for AR-15
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Standard buffer and action spring configurations in AR-15 style rifles can be inadequate, leading to inconsistent extraction and ejection, increased felt recoil, and complications in tuning and reassembly due to loose fasteners and complex reassembly procedures.
Innovation Solution
A captured spring recoil buffer assembly with a rod, action spring, and buffer designed for sliding engagement, featuring a dowel pin for secure retention and minimal noise, allowing for fine tuning and drop-in replacement in the buffer extension tube.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If standard buffer and action spring configurations are used, then the firearm can operate, but extraction and ejection become inconsistent and felt recoil increases
Solution Approach 1:
The patent modifies the physical parameters of the buffer and rod components to optimize performance. Specifically, the buffer is designed with a reduced diameter and the rod is made lighterweight, allowing for finer adjustment of the action spring tension and buffer weight. These parameter changes enable precise tuning of the bolt carrier group deceleration, improving extraction consistency while reducing felt recoil through optimized mass and spring pressure distribution.
Solution Approach 2:
The invention introduces adjustable and tunable elements into the system. The action spring can be replaced with different tension ratings, the buffer can be adjusted in position along the rod, and the rod itself can be replaced with different weights. This dynamic adjustability allows the system to be fine-tuned for optimal performance across different operating conditions, resolving the inconsistency in extraction and ejection while managing recoil characteristics.
2Ease of manufacture
If standard buffer configurations are used, then assembly is simple, but fasteners become loose and reassembly becomes complicated
Solution Approach 1:
The patent removes the traditional fasteners (set screws or retaining rings) from the buffer-rod assembly. Instead of using separate fastening elements that can loosen, the buffer is designed to be press-fitted or interference-fitted directly onto the rod. This extraction of the fastening function eliminates the fastener loosening problem entirely while maintaining simple assembly through a single-piece design that requires no additional fastening components.
Solution Approach 2:
The invention merges the buffer and rod into a more integrated assembly. By eliminating the separate fastener component and creating a unified buffer-rod structure (either through press-fit, interference-fit, or integral construction), the design simplifies the assembly process while ensuring reliable retention. The buffer and rod become functionally and structurally combined, removing the interface where fasteners could loosen.
3Device complexity
If standard buffer and rod assemblies are used, then the components are separate, but noise increases during cycling
Solution Approach 1:
The patent combines the buffer and rod into a tighter, more integrated assembly. By eliminating gaps and interfaces between separate components (through press-fit, interference-fit, or integral construction), the design reduces mechanical play and impact noise during cycling. The unified structure ensures that the buffer and rod move together as a single mass, minimizing relative motion and the associated clicking or knocking noises that occur with separate components.
4Ease of manufacture
If standard action spring configurations are used, then the assembly is straightforward, but fine tuning of the action is limited
Solution Approach 1:
The invention creates a dynamic, adjustable system where the action spring tension can be varied by replacing springs with different ratings, the buffer position can be adjusted along the rod to change leverage and tension distribution, and the rod weight can be modified. This dynamic configurability allows enthusiasts and users to fine-tune the firearm's action for optimal performance with different ammunition types, barrel lengths, and operating conditions, while maintaining straightforward assembly through standardized interfaces.
Solution Approach 2:
The patent segments the recoil management system into independently adjustable components: the action spring, the buffer, the rod, and their interrelationships. This segmentation allows each component to be optimized and adjusted separately - the spring can be replaced for tension adjustment, the buffer for position and weight adjustment, and the rod for mass adjustment. This modular segmentation provides extensive tuning capability while keeping each individual component simple and straightforward to assemble.
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 recoil buffer assembly provides optimized bolt carrier group speed and deceleration, reduces noise during cycling, and simplifies reassembly by preventing loose fasteners, enhancing the reliability and modularity of the firearm.
Implementation Method 1
An action spring located within the buffer extension tube resists this rearward force, slowing down travel until the biasing force is no longer being overcome.
Data Source
AI summary
A captured spring recoil buffer has a rod with a flanged rear end and a shaft defining a pin passage slot. An action spring is fitted around the rod and is defined by a forward end and a rear end abutting against the flanged rear end of the rod. A buffer has a cylindrical sidewall and defines an axial bore, with the cylindrical sidewall further defining a pair of aligned crosswise pin openings normal to the bore axis. The buffer is in sliding engagement with the rod, and the forward end of the action spring abuts against the buffer. A dowel pin is positioned through the crosswise pin openings on the cylindrical sidewall of the buffer and through the pin passage slot of the shaft.