Carbine Assembly Buffer Dynamics for Pistol Caliber Cycling
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Solution Overview
Problem
Existing carbine assemblies for AR15 style rifles are not fast cycling/low recoil pistol caliber, lacking essential features such as last round bolt hold open, trigger finger actuated bolt release, and ambidextrous magazine release.
Innovation Solution
A carbine assembly design that includes a bolt stop/feed assembly with a control base, control spring, control lever, bolt stop, and feed ramp, along with a longer buffer for short stroke operation, enabling fast cycling and low recoil performance, and compatibility with Glock magazines.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If conventional carbine assemblies are used for pistol caliber ammunition, then basic firing function is achieved, but fast cycling and low recoil performance are not achieved
Solution Approach 1:
The carbine assembly implements dynamic adjustment of buffer length to optimize cycling speed for pistol caliber ammunition. The buffer can be exchanged between different lengths (e.g., 2.5 inches for pistol caliber, 3.5 inches for rifle caliber) to dynamically adapt the recoil management and cycling characteristics to the specific ammunition type, enabling fast cycling while maintaining reliability
Solution Approach 2:
The system changes physical parameters of the buffer system (length, mass) to optimize performance for different ammunition types. By changing the buffer length parameter, the recoil impulse duration and magnitude are adjusted, enabling fast cycling for pistol caliber while preventing excessive recoil, thus resolving the contradiction between speed and reliability
2Productivity
If standard buffer length is used, then general compatibility is maintained, but short stroke operation for fast cycling is not achieved
Solution Approach 1:
The buffer system is segmented into interchangeable components of different lengths. The buffer can be divided into separate elements or exchanged as modular units, allowing the user to select the appropriate buffer length (shorter for fast cycling, longer for reduced recoil) based on the ammunition type, thus achieving high productivity while maintaining ease of operation through simple buffer exchange
3Reliability
If conventional feed ramp design is used, then basic feeding function is achieved, but reliable feeding of pistol caliber ammunition is not achieved
Solution Approach 1:
The feed ramp is designed with localized quality variations - different surface finishes, angles, or geometries in specific zones to optimize pistol caliber ammunition feeding. The feed ramp may have a polished surface in the cartridge engagement zone, specific angulation to match pistol ammo dimensions, and localized features to ensure reliable feeding without requiring complete redesign of the entire upper receiver, thus achieving reliability without excessive complexity
Data Source
AI summary
Provided is a fast cycling/low recoil pistol caliber carbine assembly. The carbine assembly may include an upper receiver, a lower receiver, a feed ramp, a bolt stop, a magazine, a control mechanism comprising a control lever, a control base, a control pivot pin, and a control spring, an ejector, a gap filler member. The assembly provides last round bolt hold open, trigger finger actuated bolt release, short stroke cycle, barrel ramp, ambidextrous magazine release, and uses Glock magazines.