The Eclipse PWR Stock is designed for quick adjustment, maximum stability and improved sighting, making it a supremely effective upgrade to your tactical loadout. Designed to accept HPA tanks with a max external diameter of 51mm/2", the Eclipse PWR Stock is an enhanced buttstock that combines to give both tank protection, and a fully integrated profile. The lever operated adjustment arm allows you to quickly position the PWR Stock to any of the 11 numbered lock-in points. The ergonomically contoured shoulder grip reduces slippage to help improve accuracy. Features: -Tough light GRN construction -Lever operated adjustment arm extends quickly to 11 lock-in points -Positive shoulder grip reduces slippage -Accepts HPA tanks up to a max diameter of 51mm/2" Compatibility: -Designed for use with these models of markers/setups: -Eclipse Emek MG100 -Emeks with EMC Kit installed. -Etha 2 with EMC Kit installed. Composition: -Glass Reinforced Nylon (GRN)