 Now this OEM barrel manufacturer sells direct to the public. That's HitmanIndustries.net. HitmanIndustries.net. Pick out your barrel for your next AR build or upgrade your current barrel. Go to HitmanIndustries.net. HitmanIndustries.net. Hitman Industries has a full line of rifle and pistol calibers ready to buy. Hitman Industries has all of your AR rifle and pistol needs.