Strike Industries presents a premium selection of replacement components for the AR-15, meticulously crafted to meet stringent military specifications. Designed for compatibility with .308 Cal rifles, these components ensure a superior fit and dependable performance for your AR series firearm. Each PRO set includes a comprehensive 10-piece bulk package, offering a complete solution for your upgrade or maintenance needs. Among these components, the S. I. Crush washers stand out as an essential accessory, perfect for replacing worn-out washers or securely installing a new muzzle device on your AR. With Strike Industries, you can trust in the quality and precision engineering that enhances the functionality and longevity of your rifle. The pro package includes 10 pieces Matte finish designed to complement the majority of muzzle devices Appropriate hardness to guarantee ease of installation and reliability