The Magpul Storage/Type Restricted (STR) collapsible buttstock is a storage capable version of the popular CTR model. The stock's dual, water resistant battery tubes are capable of holding 2 CR123A or AA batteries each, are accessible from the rear via hand-removable rubber plugs and provide for an enhanced cheek weld over a conventional AR-15 stock. The STR stock incorporates the strong design features of the original CTR, including the reinforced polymer A-frame body, shielded operation lever, and supplemental friction lock for reduced wobble on the receiver extension tube. Additional features include 2 integral sling loops, a reversible, push-button QD sling swivel mounting point and removable 0.30" thick rubber butt pad. Buffer tube assembly is not included.Specifications and Features: Compatible With: AR-15 Country of Origin: United States of America Fixed or Collapsible: Collapsible Mil-Spec or Commercial: Mil-Spec