Prosecutors in McAllen on Wednesday announced the penalty for 31-year-old Edgar Daniel Zapata.
Zapata last September pleaded guilty to conspiracy to possess with intent to distribute more than 6 tons of marijuana and about 145 pounds of cocaine. Zapata pleaded guilty to conspiracy to export 1,800 rounds of ammunition from the U.S. into Mexico.
A federal judge in South Texas sentenced him to 20 years in the ammo case, to run concurrently with the drug-related prison term.
Prosecutors say the investigation began in early 2011 with a tip to McAllen police and a raid on two residences.
Zapata's hometown in Mexico was not immediately released.