Magazine Well Unit with Fore and Aft Stops for Bolt Action Rifles
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Solution Overview
Problem
Bolt action rifles converted to use detachable box magazines often experience unreliability due to excessive tolerance stack-up at multiple interfaces, leading to misfeeding and instability, especially in bolt action type rifles like the Remington 700 Long Action, which were not designed for such magazines.
Innovation Solution
A magazine well unit with fore and aft stops is introduced, which includes a firearm interface, a lower portion for receiving a box magazine, and a lever to securely attach the magazine, reducing tolerance stack-up by controlling the magazine's position and preventing excessive movement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a bolt action rifle is converted to use a detachable box magazine by modifying the stock and trigger guard interface, then the magazine can be removed and replaced, but the tolerance stack-up at multiple interfaces causes excessive relative movement and reduces reliability
Solution Approach 1:
The bottom metal is divided into separate functional segments: a magazine receiving well portion and a trigger guard interface portion. This segmentation allows the magazine well to be precisely fitted and isolated from tolerance variations at the trigger guard interface, thereby maintaining feeding reliability while enabling detachable magazine functionality.
Solution Approach 2:
A precisely fitted magazine well acts as an intermediary component between the magazine and the rifle action. This intermediary isolates the magazine interface from the variable trigger guard to stock interface, preventing tolerance stack-up from affecting magazine feeding reliability while still allowing detachable operation.
2Shape
If the trigger guard to stock interface is used to control magazine placement, then the magazine can be positioned, but the interface is affected by gunsmithing competence and wood warpage causing significant variation
Solution Approach 1:
The magazine placement control function is extracted from the variable trigger guard to stock interface and relocated to the magazine well itself. The magazine well is directly fitted to the rifle action with precise dimensions, removing dependency on the gunsmithing quality of the trigger guard interface and eliminating the influence of wood stock warpage on magazine placement consistency.
Solution Approach 2:
The magazine well is pre-fitted to the rifle action with precise dimensions before final assembly. This preliminary precision fitting establishes consistent magazine placement independent of subsequent trigger guard installation variations or stock dimensional changes due to environmental conditions.
3Ease of repair
If the bottom metal is made long and narrow to be replaceable for repair, then the bottom metal can be maintained, but the shape allows the magazine to rock within the receiving space
Solution Approach 1:
The magazine is nested within a precisely fitted magazine well that provides lateral and longitudinal constraints. This nesting arrangement prevents the magazine from rocking while still allowing the bottom metal to be replaced for repair, as the magazine well maintains the stabilizing geometry even when the bottom metal is swapped.
Data Source
AI summary
A magazine well unit and a method are disclosed. The magazine well unit may have an upper portion having a firearm interface; a lower portion; a proximal portion; and a distal portion. The distal portion may have a magazine well to removably receive a box magazine. The magazine well may have at least one fore stop and at least one aft stop, the at least one fore stop and the at least one aft stop shaped to prevent the box magazine from passing beyond the upper portion of the magazine well unit. At least one of the fore stop or the aft stop may have an upper portion region having a surface for engaging the firearm.