This is the full size AR-15 M-16 Rifle buttstock, OEM Military issue.
AR-15 and M-16 Buttstocks
AR-15 and M-16 style buttstocks
Double Star AR-15, M-16, and M4 6 position Buttstocks that are tactical and U.S. Military style buttstocks for the AR-15 M-16 Rifle. Most buttstocks are done in either Commercial and Mil-Spec buffer tubes. AR-15 A-2 Buttstock
, 6 position buttstock
, Mil Spec 6 position buttstock