The Blastar Mil-Spec AR-15 thumb hole fixed stock has an internal storage compartment in the pistol grip, a rubber buttpad for comfort, and a featureless stock grip plate insert. This drop-in AR-15 fixed thumbhole stock is only compatible with MIL-SPEC AR15/M4 carbine buffer tubes. The fixed buttstock is constructed of heavy-duty polymer and hard anodized aluminum. The AR stock features multiple QD sling cup points to install a QD sling (cups not included) and a sling slot. It comes with a black thumbhole fixed stock, mounting bolts, and a tool. The stock has a 9-inch length of pull. It includes a stock-grip plate insert for featureless building applications.