The CQR Buttstock is designed for the LE/Military market to create one of the most rigid and compact Rifle Systems based on the widely available AR15 Plattform. The CQR Riflestock is a easy to install replacement buttstock for Mil-Spec AR15 Rifles using a Mil-Spec (recommended) Carbine Buffertube. This model comes with an aluminum plate that fits over the thumb-hole.