UK. Best Hulu started to run with production and design of walnut stocks and other parts of shotgun in 1977. It is a gas operated, semi-automatic shotgun that uses an exoskeleton of aluminium with. 1,635. . MERCH (10 off with code &x27;FHUCK&x27;) httpsfhuckoutdoors. The barrels of these shotguns feature elongated forcing cones.