Internal diameter 6.03mm built for precision shooting Suitable for M16A1 / M16A2 / M16VN / AUG / M14/ M249 Series Airsoft Electric Gun AEG Rifle Eight precision rifling setting allows BB bullet to guide airflow of BB bullet in order to reduce the friction on muzzle end Perfect for tight grouping & accurate shooting
Length: 510mm Inner Diameter: 6.03mm
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