Highly rated with many superb reviews, SEACs range of Pneumatic Spearguns are available via BlueWaterSports in a range of lengths. Tank: aluminium alloy cylinder with a 40 mm diameter Butt: Light alloy muzzle with increased holes to optimize the discharge of water Handle: ergonomic and functional form. Made in one material Barrel: the 13 mm diameter allows the use of an 8 mm spear Includes: steel spear, injector, harpoon, harpoon loader, line.