It moves your tank 5.5 inches forward and 2.5 inches down. It also includes an ASA with a hole for a gauge if you need it. (The hole is plugged when you get it). You can either leave the plug in, or remove the plug to install a gauge. It has holes drilled to mount on Standard or Spyder bottom lines. Will work with all CO2 tanks and screw-in nitrogen tanks. Also available in a satin silver finish for $10 more.
The Dead On Paintball Pro 2 Drop Forward is older, so while it may be available used and in a few cases new, it is not commonly available anymore.