SILVERGenuine Psycho Ballistics Z Drop Forward. Fits any size tank from a 20 oz CO2 to a 114 ci Nitro. Unique design has lockable dual pivot points for easy customization. Provides optimal air system placement that best matches you and your playing style. On/Off valve saves precious air. Drops your tank about 3 inches forward and about 2 inches down. Standard 2-hole marker mounting configuration.