Strike Industries presents a premium selection of replacement components for the AR-15, meticulously crafted to meet stringent military specifications. Designed for .223 Cal rifles, these components ensure an exceptional fit and dependable performance for your AR series firearm. Available in PRO sets, each package includes 10 high-quality pieces, offering a comprehensive solution for your rifle maintenance and enhancement needs. Among these components, the S. I. Crush washers stand out as an ideal choice for replacing worn-out washers or for securely installing a new muzzle device on your AR. With Strike Industries, you can trust in the durability and precision engineering that supports optimal firearm functionality. 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