The Prometheus V2 Upgrade Set is a combination set that includes everything you need for FPS upgrades at a fraction of the cost. This set is compatible with most standard V2 gearboxes and includes a Prometheus patch and catalog. Made in Japan, this upgrade set is made from high-quality materials and is designed to last. The set includes all the necessary components for a complete upgrade, including a high-quality piston head, air nozzle, spring guide, and a steel spring. The set is easy to install and will provide a significant boost in FPS for your airsoft gun. Additionally, the set comes with a Prometheus patch and catalog, making it a great gift for airsoft enthusiasts. Upgrade your airsoft gun’s FPS with the Prometheus V2 Upgrade Set and dominate the battlefield.