Firearm Magazine Adapter With Bolt Catch Actuator
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Solution Overview
Problem
Existing magazine adapters for converting firearms to use smaller caliber ammunition often face challenges in securely attaching to the rifle, causing stress on the receiver components and failing to automatically hold the bolt open after the last round is fired, which is crucial for maintaining original rifle operation and training accuracy.
Innovation Solution
A magazine adapter with a base that includes a bolt catch actuator and a spring-biased plunger, allowing the adapter to be securely positioned within the magazine well without stressing the rifle, and automatically activating the bolt catch upon the last cartridge being fired by using a follower projection to push the actuator upward.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the adapter is secured between the upper receiver and lower receiver, then the adapter can be positioned in the magazine well, but there is difficulty in securing the receivers together and stress on the forward screw and rear pin
Solution Approach 1:
The adapter serves as an intermediary component that interfaces between the magazine and the rifle's bolt catch mechanism. It includes a bolt catch actuator that mediates the interaction between the magazine follower and the rifle's bolt catch, allowing the adapter to transmit the bolt-open signal without requiring direct modification or stress on the receiver connection points.
Solution Approach 2:
The adapter is divided into functional segments: a base portion that interfaces with the magazine well, a follower interface portion that engages the magazine follower, and a bolt catch actuator portion that interfaces with the rifle's bolt catch. This segmentation allows each component to perform its specific function independently, reducing stress on the overall receiver assembly.
2Extent of automation
If the adapter uses a two-piece follower with an upper displaceable portion, then the bolt catch can be actuated automatically, but the adapter structure becomes more complex
Solution Approach 1:
The adapter utilizes the magazine's existing follower mechanism to actuate the bolt catch automatically. When the magazine follower reaches its uppermost position after the last cartridge is expended, it directly engages the bolt catch actuator, causing the bolt to open without requiring additional power sources or complex actuation mechanisms.
Solution Approach 2:
The adapter is designed to work with the existing magazine follower mechanism that is already present in the rifle system. By utilizing the follower's natural movement and position, the adapter achieves automatic bolt catch actuation without requiring a completely new follower design, thereby reducing overall system complexity.
3Ease of operation
If the upper receiver and lower receiver are secured close together, then the adapter can fit in the magazine well, but there is difficulty in securing the receivers and potential stress on fasteners
Solution Approach 1:
The bolt catch actuation function is extracted from the direct receiver-to-receiver connection and implemented through the adapter's bolt catch actuator. This allows the adapter to perform the bolt-open function independently without requiring the upper and lower receivers to be forced into close proximity, thereby reducing stress on the receiver fasteners.
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 adapter ensures secure installation and removal, maintains original rifle functionality, and allows for accurate training by automatically holding the bolt open, facilitating the use of various upper assemblies and conversion units without unnecessary stress on the rifle.
Implementation Method 1
A spring-biased plunger is secured within the base
Implementation Method 2
the follower pushes the actuator upward
Data Source
AI summary
A magazine adapter includes a base that is structured to fit within the magazine well of a firearm, and to accept a magazine designed for smaller caliber ammunition than the original firearm. The adapter includes a bolt catch actuator slidably mounted therein. Magazines for which the adapter is intended include an upwardly extending rear projection of the follower, projecting from an opening in the rear of the magazine housing when the follower is in an upper portion of the magazine. When the upwardly extending projection pushes upward on the bolt catch actuator, the bolt catch is actuated, holding the firearms bolt in a rearward position. The magazine adapter thereby facilitates use of the original firearm controls with a caliber conversion unit, or with an upper receiver and barrel combination of a different caliber.