Ballista BAT 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 Triangle Buttstock Upgrade Kit: Manufacturer: Ballista Color: Black Weight: 1.5 lb Fabric/Material: Aluminum Finish: Gloss Features of Ballista BAT Triangle Buttstock Upgrade Kit Compatible with BALLISTA BAT Not compatible with BALLISTA BAT Reverse Package Contents: Ballista BAT Triangle Buttstock Upgrade Kit Special Trigger System Ballista BAL-AC-13: BAT Triangle Buttstock Upgrade Kit Extendable