R/T-Cyclone Hole: Yes; FVA: No. "Goldmember" JCS Power Tube for A5 paintball guns. This tube is for users with custom applications, not for new users. Constructed like #75155, but gold anodized, it does not have a front velocity adjuster. If your marker is set up with the front velocity adjuster (F.V.A.) full open, this product is for you. THIS ITEM SHOULD NOT BE USED WITHOUT A VELOCITY CONTROLLING DEVICE INSTALLED ON THE MARKER, SUCH AS JCS #66148 (Rear Velocity Adjuster). Therefore, JCS does not recommend this item for new players. Instead, buy item 75155 (Red Hot Power Tube), which has velocity control. Visit the A5 Owners Group to learn more. This product is a specialty item and does not work with all gun setups.