The Guntec USA UPPER-VISE Dual AR 5.56 / .308 Cal Upper Receiver Aluminum Vise Block is a must-have for firearm enthusiasts, offering unbeatable precision and reliability for your firearm maintenance needs. Crafted from premium T6 aluminum, this lightweight yet robust vise block ensures a secure setup for both BCG and charging handles across multiple configurations, making maintenance straightforward and efficient. T6 Aluminum Works With BCG And Charging Handle Installed Or Not Installed Lightweight, Extremely Durable Tight Fit Fits 5.56 And .308 Cal Upper Receivers Upper Locks Into Position With Two Pins Anodized Finish Fits Bench Vises Tool Efficiently Helps With Install Of Barrels Or Free Floating Handguards This vise block is essential for any AR enthusiast seeking precision in assembly and maintenance.