Sean Christopher Steward was sentenced to 108 months in federal prison and Jacob Anthony Montelongo drew a sentence of 41 months, KNXV-TV, Phoenix, reported Tuesday.
The U.S. attorney's office said both men pleaded guilty.
"Steward and Montelongo were two of the most prolific straw purchasers in the Phoenix-based firearms trafficking conspiracy," prosecutors said.
Steward admitted to conspiring to illegally obtain AK-47 rifles on behalf of others and making false statements during the process.
Prosecutors said he participated in the delivery of weapons to Mexican drug-traffickers.
Montelongo pleaded guilty to conspiracy, making false statements and smuggling goods from the United States.
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