The Winchester 1300 (Defender) is a pump action shot gun, known for its reliability. It comes with wooden as well as fiber stock and fore end. The 1300 derived its design from the 1200. The 1200 was introduced somewhere in 1964’s and was also used by the military. The military versions were also known to have bayonets installed at their front end. It comes in variable calibers, 12 gauge, 16 gauge and 20 gauge. It is a robust gun, very reliable and easy to use. The gun being talked about here is a 12 gauge.