Ballista BAT Reverse Triangle Buttstock Upgrade Kit Extendable. Ballista extendable Triangle buttstock is designed to improve your shooting game. Elevate your crossbow shooting skills with this stock. It comes equipped with a special trigger system ensuring the accuracy and effectiveness of each shot. Feel the difference in precision and control with this exclusive upgrade. Specifications for Ballista BAT Reverse Triangle Buttstock Upgrade Kit: Manufacturer: Ballista Color: Black Weight: 1.5 lb Fabric/Material: Aluminum Finish: Gloss Features of Ballista BAT Reverse Triangle Buttstock Upgrade Kit Compatible with BALLISTA BAT Reverse Not Compatible with BALLISTA BAT Package Contents: Ballista BAT Reverse Triangle Buttstock Upgrade Kit Special Trigger System Ballista BAL-AC-15: BAT Reverse Triangle Buttstock Upgrade Kit Extendable