The Warrior Tippmann Stock is compatible with Tippmann A5/98/X7 markers. The stock is made from a durable aluminum and is very comfortable when installed on a marker. The best part about the stock is that it comes with a rear velocity adjuster. This means you can control the main spring tension of the marker; something you could not do before you had this stock. Now you can control the efficiency of the marker and control the way your gun shoots.