Developed to suit the needs of a performance-based shooter, the Strike Industries Optimus Weight Buffer provides rapid modular customization that can be performed by the user. Changing out the buffer is one of the most direct upgrades to the AR platform, the Optimus WB comes with standard H1-H3 weight distribution, or it can be adjusted to the specific weight needs of the shooter. The Optimus WB will increase the reliability, accuracy and performance of the AR shooting platform. Package Includes: Buffer Head (Impact Side), Buffer Main Body w/TPU End Cap, two Tungsten Weights, two S45 Steel Weights, two 6061 Aluminum Weights, three POM Weights, S45 Steel Roll Pin, six rubber spacers and 10 O-rings.