A look at the KTW Ithaca M37 Featherlight airsoft shotgun in this video review by Mach Sakai. The Ithaca M37 is a pump-action shotgun that has been in production since 1937 and has been used by the US military and law enforcement agencies. KTW has created a replica of this shotgun with realistic construction and a high capacity of 46 rounds. It also has an adjustable hop-up and can switch between single and double BB firing.