F.A.B. Defense GL-Core S AR-15 Buttstock, Small and Compact Design, Fits Mil-Spec And Commercial Tubes, Black FX-GLCORES The GL-Core S was specifically designed for one of the best Israeli Counter-Terrorism units" to be used as a primary buttstock. It is short and compact for CQB scenarios but will still provide strength and stability for mid-range engagements. It features an integrated cheek weld" non-slip slim buttpad and an interchanging buffer tube adapter that allows it to fit on either Mil-Spec and Commercial buffer tubes. Comes with two integrated QD sling swivel sockets.