Built with a sturdy, copper manganese alloy coated with coated with nickel Compatible with Tokyo Marui and other compatible with other AEG Rifles/SMGs Durable, rigidly weighted barrels minimize vibrations and consistently improves accuracy Air Track Inner Bore design reduces air dispersion to maintain BB stability as it travels out of the barrel Hop-up bucking includedSpecifications: Brand Poseidon Build Nickel Plated Copper Inner Barrel Diameter 6.05mm Inner Barrel Length 407mm Compatibility Tokyo Marui and Most AEGs 1X Inner Barrel