The Real Avid Smart-Fit Vise Block in Gray and Red is a versatile tool essential for any AR15 enthusiast. Crafted from durable polymer this vise block is designed to fit seamlessly into any AR15 magazine well providing a stable platform for maintenance tasks. Whether you're swapping out buffer tubes or adjusting fixed stock receiver extensions the Smart-Fit Vise Block offers a customizable fit with its easy-to-use adjustment handle. Additionally its innovative design allows compatibility with inverted lower receivers facilitating work on pistol grips or access to the AR15's underside. The included Pivot Lock secures the firearm in an open position simplifying cleaning and maintenance of the chamber and barrel. Upgrade your gunsmithing tools with this reliable and adaptable vise block tailored for precision and ease of use.