The B5 Systems Enhanced SopMod stocks are an official pick of the U.S. military, and helped thousands of soldiers make the most of their skill in the field. From active engagements to shooting off rounds at the range, this stock enhances accuracy, precision, and fit. When you aren't worrying about wobble, slippage, and improper cheek weld, you can focus on what really matters: Taking your performance to the next level. This is a tried and true design for ultimate comfort and accuracy.Specifications and Features: Compatible With: AR-15 Country of Origin: United States of America Fixed or Collapsible: Collapsible Material: Polymer Mil-Spec or Commercial: Mil-Spec