Income disclosure: We are reader supported, and earn affiliate commissions when you buy via links found on DIVEIN.com: The external barrel is hydroformed which adds to the buoyancy and hydrodynamics of this sleek gun. One piece of anodized aluminum forms the muzzle and lessens friction when the shaft exits. http://beuchatzpknherocarbonakka49250.get-blogging.com/11997704/beuchat-hero-carbon-speargun-open-head-ile-ilgili-detaylı-notlar