A former Army sergeant from San Antonio, Texas is facing up to 30 years in prison after admitting in a federal court that he funneled dozens of assault rifles to operatives of Mexico’s Gulf Cartel.

Sgt. Julian Prezas acknowledged acquiring and selling 42 firearms, the San Antonio Express-News reported, but a co-defendant turned informant said just last year Prezas sold him 13 AR-15s, some 50 to 60 AK-47s and a shotgun.

The unnamed informant said he told Prezas that the guns were going to Mexico, the newspaper said, citing a plea deal formalized on Monday.

Prezas, 36, worked as a military recruiter.