Modular Receiver Cammed Lever Barrel Changeover
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Solution Overview
Problem
Existing firearms lack a reliable and tool-free method for quickly changing barrels of different lengths and calibers, which limits accuracy, safety, and practicality, especially in field applications where swapping entire upper receivers is necessary.
Innovation Solution
A modular receiver system with a unique cammed lever action using 'half-moon' cams to securely lock the barrel in place, allowing for rapid barrel changeovers without tools and accommodating various barrel lengths and calibers, along with a non-integral rail system for improved rigidity and accessory attachment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If pinning or bolting the barrel to the receiver by means of an external fastener, then the barrel and receiver can be attached together, but the union does not approach the theoretical rigidity of a single member, thus limiting the accuracy of the firearm
Solution Approach 1:
The patent merges the barrel and receiver into a single integrated unit through a monolithic barrel extension that is part of the receiver assembly. This eliminates the need for separate fasteners and creates a unified structure that achieves theoretical rigidity, directly resolving the contradiction between attachment strength and manufacturing precision/accuracy.
2Strength
If threading the barrel to the receiver, then a rigid union can be achieved, but threading is not practical in firearms adapted to fire rimmed ammunition
Solution Approach 1:
The patent segments the barrel assembly from the receiver by using a separate barrel extension component that interfaces with the receiver's front opening. This segmentation allows the barrel to be threaded for rigidity while maintaining compatibility with rimmed ammunition through the separate extension design, resolving the contradiction between strength and ease of manufacture.
3Adaptability or versatility
If swapping entire upper receivers to change calibers or barrel lengths, then different calibers can be achieved, but the process is time-consuming and not practical for field applications
Solution Approach 1:
The patent creates a dynamic barrel change system where the barrel extension can be quickly detached and replaced through a simple lever action mechanism. This dynamic design allows users to switch between different calibers and barrel lengths in the field without swapping entire upper receivers, resolving the contradiction between adaptability and time loss.
4Productivity
If using a modular receiver system with cammed lever action, then quick and tool-free barrel changes can be achieved, but the device complexity increases
Solution Approach 1:
The patent implements a self-service barrel change mechanism where the cammed lever action allows users to quickly attach and detach barrels without requiring tools or complex procedures. The system serves itself by using the barrel's own weight and the lever mechanism to achieve rapid changes, resolving the contradiction between productivity and device complexity.
Data Source
AI summary
A modular receiver system for firearms comprising a barrel and receiver assembly providing a quick changeover coupling means for connecting the barrel to the receiver, wherein the coupling means comprises a barrel retaining bushing and a pair of opposed cam surfaces on the receiver for hinged engagement of the cam surfaces against the barrel, and wherein the modular receiver system further comprises a rail system for mounting ancillary firearms equipments.