Jeff The KID talks about the Aluminium Alloy Barrel made for the Action Army AAP-01. The machine translation is problematic so try to make sense out of it to understand more... "The long-awaited AAP-01 aluminum alloy barrel is open for pre-orders. The position is exactly the same as AAP-01. There is an O-ring in the flasher cap to prevent the flasher cap from loosening due to the action of the gun. The weight of the gun is better. The color is gold, silver and matt black. The three flasher caps are unified. Matte black (the color is mainly the actual product) A set of aluminum alloy barrels and aluminum flash caps are included. The price is NT$1,380. From now to 12/1, the gun friends who order from now to 12/1 enjoy free shipping from store to store."