Having spare parts on hand when you need them is a diver's motto. Your spear gun is difficult if not impossible to load the slings without the gun butt. The gun butt gives proper distribution of force created by placing the butt of the gun up against your body when stretching the slings to load the gun. A spare Gun Butt can assure you always come home with game.
The JBL Deluxe Gun Butt fits JBL spear guns with a 1" (2.5 cm) barrel and is easy to install. Gun Butt is made from noncorrosive impact resistant plastic material. Deluxe Gun Butt is a great Save-A-Dive kit Item.