Black Rain Ordnance Ejection Port Cover Assembly .308 Caliber. When closed it appears to be a simple cover pop the charging handle and Let It Rain is stamped on the inside of the cover. Comes with all hardware needed to install. .308 Caliber. Specifications for Black Rain Ordnance Ejection Port Cover Assembly .308 Caliber BRO-EDC-308: Manufacturer: Black Rain Ordnance Caliber: .308 Winchester Projectile Caliber: .308 Caliber The Black Rain Ordnance Ejection Port Cover Assembly .308 Caliber BRO-EDC-308 is a quality addition to the Black Rain Ordnance lineup. For more great deals on AR15 Upper Parts by Black Rain Ordnance please browse our Black Rain Ordnance Gun Parts page. Black Rain Ordnance Ejection Port Cover Assembly .308 Caliber