UBR Stock, FDEThe Magpul UBR (Utility Battle Rifle), U. S. Patent 6651371, is a fully featured, adjustable butt stock for the AR15 M16. Unlike typical collapsing stocks, this modular design offers the stability of a fixed stock with consistent cheek weld in any position. Seven position length of pull (LOP) adjustment is quickly executed with gross motor movement while the integral preset system allows direct access to a preferred position. A robust lock mechanism