Your browser isn’t supported any longer. Update it to obtain the ideal YouTube knowledge and our most up-to-date functions. Find out more We Particularly such as developed-in rear MBUS sights on some of the AR designs. The MBUS sights are adjustable and correspond to a regular A2 type front publish. https://ammunitionsdistros.com/product/american-tactical-milsport-300-blackout-optics-ready-semi-automatic-rifle-with-mlok-rail/