Remington Model 31
[2] While the Remington Model 17 enjoyed some success, a solid, 12-gauge featuring side-ejection was needed to compete with Winchester.The Federal Bureau of Investigation acquired one Model 31 per office in 1935 in response to the Kansas City Massacre.During World War II Remington produced a Model 31 riot gun for military use.These were stamped "U.S. Property" on the left side of the receiver and had an approximate serial number range of 51000–63000.Notable differences are the use of a two-piece bolt with separate locking piece as well as a significantly simplified barrel mounting system.