It is the Xtreme version of the homonymous model'” for extreme performance
Tanfoglio Stock Master Xtreme, Semi-automatic, DA/SA, Steel Frame Pistol, 9MM, 4.75″ Barrel, Matte Finish, Black, Walnut Grips, Ambidextrous Safety, Adjustable Sights, 17 Rounds TF-STOCKMX-9
