Customs officers in Hanoi are investigating the smuggling of gun parts from the UK and US after seizing a number of barrels the past month.
The officers and Hanoi Post Office on Wednesday found two gun barrels and a rifle scope in two parcels to be delivered to a person in Cao Bang Province in northern Vietnam.
Around a month ago, a UK gift package to a recipient in Cao Bang was also found to contain 13 barrels.
The authorities have not revealed if the two cases are related.
Vietnam does not allow gun ownership by regular citizens, and yet there have been regular attempts to smuggle in the weapon from overseas