The material is a reflector gunsight glass, conforming to MIL-R-6771, Type 1. The color is lusterless black (No.37038) in accordance with FED-STD-595. This item is an upper type, with line of sight deviation not exceeding 15 seconds. It features beveled edges and a fine gray ground. The reflective coating has a non-polarized aspect, with 24% reflectance and 3% porosity. An anti-reflective coating of high efficiency (MgF) per MIL-C-675 is applied, resulting in maximum average reflectance of 0.9% and maximum absolute reflectance of 1.4%. The wavelength range for reflectance is between 400-700 nanometers, with an angle of incidence at 51 degrees. The dimensions are 16.520 inches in length, 8.750 inches in width, and 0.230 inches in thickness.