Optex Systems Holdings, Inc manufactures and sells optical sighting systems and assemblies primarily for the U.S. department of defense, foreign military applications, and commercial and consumer markets in the United States. It offers periscopes, such as laser and non-laser protected plastic and glass periscopes, electronic M17 day/thermal periscopes, and vision blocks; and sighting systems, including back up sights, digital day and night sighting systems, M36 thermal periscope, unity mirrors, optical weapon system support and maintenance, commander weapon station sights, and sight assembly refurbishments. The company also provides howitzers comprising M137 telescope, M187 mount, M119 aiming device, and XM10 aiming circles; and applied optics center consisting of laser interference filter, optical assemblies, laser filter units, reticles, day windows, and specialty thin film coatings, as well as other products, such as muzzle reference systems, binoculars, collimators, speedtracker, optical lenses and elements, and windows. In addition, it offers various periscope configurations, rifle and surveillance sights, and night vision optical assemblies. The company's products are installed on various types of U.S. military land vehicles, such as the Abrams and Bradley fighting vehicles, light armored and advanced security vehicles, and the Stryker family of vehicles. The company offers its products directly to the federal government, prime contractors, and foreign governments. Optex Systems Holdings, Inc was founded in 1987 and is headquartered in Richardson, Texas. Optex Systems Holdings, Inc is a subsidiary of Sileas Corporation.