Yoahjan Lara Flores, Arturo Lara and Alfredo Rubio Lara pleaded guilty in March to conspiracy to possess an unregistered firearm or destructive device.
The launcher is a favored weapon by drug trafficking organizations operating along the U.S.-Mexico border, according to court documents.
An undercover agent with the U.S. Bureau of Alcohol, Tobacco, Firearms and Explosives posed as a weapons trafficker and met and spoke with the men several times to broker a deal for arms destined for Mexico. On Sept. 29, they met in an El Centro parking lot to go through with the $1,900 deal. Lara Flores and Lara, both 22, were arrested there; Rubio Lara, 27, was arrested months later.