This lightweight and strong buttstock easily mounts to ACE folding mechanisms or receiver blocks with the supplied hardware. The length of the stock can be increased 1/2" with the included rubber recoil pad. The end cap and butt are machined from solid aluminum billet, oxide blasted and hard anodized. Top bar and center brace are turned from the super strong engineered polymer Delrin. This stock is the strongest and highest quality skeleton stock available. The Modular Skeleton Buttstock also features QD sling swivel mounts in five places on the buttstock and includes a QD sling swivel.