It's Folding, it's collapsible, it's the Folding Collapsible stock from Tippmann. The collapsible feature of this stock has six positions to adjust to the optimal length for almost anyone. The stock will also fold to optimize performance in close quarters battle. This stock will fit Tippmann 98 Markers & All US Army markers. The stock includes an adapter for use on Tippmann 98 Markers that will allow this or any other US Army stock to be mounted to the Tippmann 98 series of paintball guns.