The Rival Arms RA91R101A is also known as the ST-3X Rifle Chassis stock. It has been meticulously engineered via CNC machining, utilizing billet aluminum to create a robust yet skeletonized body. The stock also accommodates personal adjustment with a vertically adaptable butt pad and cheek rest.
In addition, it is outfitted with an M-LOK slot and supplemented by two QD disconnect sling mounts for added convenience. The ST-3X has been designed for compatibility with rifle chassis systems that require a buffer tube style stock attachment. However, it is important to note that it is not compatible with AR-15 rifles or other rifles that utilize a moving buffer system.
The RA stock is specifically crafted to pair with a rifle chassis that accepts a buffer tube style stock, demonstrating the tailored and precise design of the Rival Arms RA91R101A.