Two men were arrested in Binh Phuoc Province on Tuesday after police found in their truck a cache of weapons, including hundreds of air rifle and suppressors.
Local police said when they stopped the truck on National Road 13 after they found it suspicious, a man in the cabin fled into a forest nearby.
He was arrested after a four-hour chase hunt, and was identified as Le Van Thanh, 44, allegedly the owner of the weapon load.
The other man in the truck was its driver Tran Nam Tuan, 27, who was also arrested.
The police found in the truck 388 made-in-Indonesia air rifles, 177 suppressors, and a 5-kg box of flash powder used to make firecrackers.
Thanh told the police he bought the guns from an unidentified man in An Giang, a Mekong Delta province bordering Cambodia.
He said he paid $25 for a gun, and expected to resell them to bird hunters in Binh Duong Province at $50 apiece.
Illegal manufacturing, trafficking and trade of weapons is a crime under Vietnam's Penal Code, which is punishable by prison terms ranging from one year to life imprisonment.
Further investigations are ongoing.