Features - Durable brass alloy construction - Unique "Crazy Jet" inner barrel creates an air cushion around the BB as it exits the barrel to reduce air resistance for improved performance - Designed to reduce air loss between the BB and enhance accuracy, speed, and power - 6.02mm tightbore design - Flexible compatibly with VSR-10 rifles and the Tokyo Marui Non-Blowback MK23 gas pistol Manufacturer: Maple Leaf Specifications: Inner Diameter: 6.02mm Compatibility: Tokyo Marui Non-Blowback MK23 gas pistols and VSR-10 bolt action airsoft rifles Material: Brass Alloy