The Agency Arms Battle Plate is machined out of 6061 Aluminum. It is machined to precisely cover and protect a slide that has been machined for the Trijicon RMR family of red dot sights. This battle plate was designed around an Agency Arms milled slide with a dedicated optic cut (WILL NOT FIT AOS). We can ONLY guarantee fitment on one of our slides. This MAY NOT fit other Manufacterer's RMR cuts.