This Mil-Spec AR-15 M4 Fixed Carbine Stock gives you a non-collapsing buttstock option with a thumb hole cover included to make it CA compliant if needed. This fixed AR stock fits mil-spec carbine-length buffer tubes. This fixed M4 stock has an internal storage compartment in the pistol grip and a rubber butt pad for comfort. It is constructed of polymer and hard anodized aluminum. The stock features multiple QD sling cup points for installing a QD sling (cups not included). The color is black, and mounting bolts and tools are included. Please consult your local laws and regulations to ensure compliance.