Convertible Gas Piston Assembly for AR-15 and AR-10 Rifles
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Solution Overview
Problem
Existing piston conversion systems for AR-15 and AR-10 rifles are limited by their inability to interchange between platforms, require costly part replacements for different gas systems, restrict ammunition caliber selection, and fail to address carrier tilt issues, leading to excessive wear and damage.
Innovation Solution
A convertible gas piston conversion system that uses a gas block with dual configurations for AR-15 and AR-10 compatibility, a segmented op-rod assembly for adaptable gas system lengths, and an anti-tilt/anti-wear buffer device to mitigate carrier tilt, allowing for efficient operation without major component replacements and enabling low profile gas block usage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a single piston system is used for both AR-15 and AR-10 platforms, then platform versatility is improved, but the system cannot adapt to different gas system lengths without costly part replacement
Solution Approach 1:
The operating rod assembly is divided into multiple segments: a piston portion, an operating rod portion, and connecting portions with external threads. These segmented components can be independently assembled and disassembled, allowing the same piston system to accommodate different gas system lengths (carbine, mid-length, rifle) by simply changing the connecting portions rather than replacing entire parts.
Solution Approach 2:
The piston system is designed with universal compatibility features including a gas block with dual piston cylinder bores (one for AR-15, one for AR-10), and an operating rod assembly with external threads that can accept different connecting portions. This multi-functional design allows a single piston system to serve both AR-15 and AR-10 platforms across various gas system lengths.
2Productivity
If the operating rod strikes the bolt carrier off-axis, then the bolt carrier is actuated to cycle the rifle, but carrier tilt occurs causing excessive wear and damage
Solution Approach 1:
An anti-tilt buffer device is installed in the bolt carrier to preemptively counteract the tilting motion caused by off-axis striking. The buffer device includes a buffer portion that contacts the operating rod and a buffer tube that guides it, creating a preliminary counter-action that prevents carrier tilt before damage can occur to the upper receiver or buffer tube.
Solution Approach 2:
The anti-tilt buffer device acts as an intermediary element between the operating rod and the bolt carrier. It mediates the force transmission by providing a guided contact surface that ensures the operating rod strikes the bolt carrier impingement lug in a controlled manner, preventing off-axis contact and subsequent carrier tilt while still enabling effective cycling.
3Ease of operation
If a standard gas block is used, then the piston cylinder can be accessed for assembly, but the gas block height exceeds low profile requirements
Solution Approach 1:
The piston cylinder is designed to nest within the gas block structure. The gas block contains a piston cylinder bore that receives the piston cylinder, allowing the piston assembly to be contained within the gas block's external dimensions. This nesting arrangement enables a low profile gas block that meets height requirements while still providing access to the piston cylinder for assembly through the gas block's internal cavity.
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
Enables seamless interchange between AR-15 and AR-10 platforms, adapts to various gas system lengths without costly replacements, maintains efficiency across ammunition types, and significantly reduces wear and damage from carrier tilt, improving overall system reliability and usability.
Implementation Method 1
The gas block is secured to the barrel to prevent movement of the gas block relative to the barrel and is configured to hermetically transport the discharge gas from the barrel through the gas block and on into the piston cylinder bore
Implementation Method 2
The actuating means, which includes discharge gases from the rifle, imparts a kinetic energy on the op-rod assembly and permits the op-rod assembly to be moved linearly in a breechward direction
Implementation Method 3
A biasing means urges the op-rod assembly towards the piston cylinder with an urging force and permits translational movement of the op-rod assembly when the urging force is exceeded by the force of the actuating means
Data Source
AI summary
A convertible gas piston conversion system for the AR-15, AR-10, or their variant rifle platforms is provided to convert the platform from a direct impingement gas system to a piston driven operating system. The conversion system includes a gas block having a barrel bore and two piston cylinder bores one on either side of the gas block. One of the piston cylinder bores is for utilization of the AR-15 rifle and the other of the piston cylinder bores is for utilization of the AR-10 rifle, making this piston system convertible for either the AR-15, AR-10, or any of their variant rifle platforms. A piston cylinder is inserted into the gas block via the piston cylinder bore and a piston is actuated inside the piston cylinder to cycle the rifle. A connecting link is coupled between the piston and an op-rod making the gas systems length adjustable by simply replacing the connecting link. The op-rod acts directly upon a carrier lug to cycle the rifle and a compression spring or the like returns the piston back into the battery within the piston cylinder. An op-rod bushing guides the op-rod throughout travel. A bolt carrier includes a lug and an anti tilt/anti wear device. The bolt carrier provides a lug for the op-rod to impinge upon to cycle the rifle. The anti tilt/anti wear bolt carrier device installs into the rear of the bolt carrier to minimize damage and wear to the buffer tube and upper receiver from a condition identified as carrier tilt.