DALLAS, Texas — A federal grand jury has indicted a Dallas man on four counts of possession of an unregistered firearm and eight counts of distribution of a controlled substance.

According to court documents, 21-year-old Ramon Navarro III, aka Trae Alvarez, allegedly possessed at least four standalone machinegun conversion sears, three-piece devices designed to convert semi-autmoatic weapons into machineguns.

"Unlike semiautomatic firearms, machineguns – weapons that can shoot more than one shot, without manual reloading, by single function of the trigger – are generally unlawful for civilians under the National Firearms Act," stated a release from the U.S. Attorney's Office in the Northern District of Texas.

In addition to the standalone sears, Navarro allegedly possessed at least six Glock pistols with the sears incorporated — effectively changing the Glocks into machineguns.

Navarro sold an undercover ATF agent at least three of the converted Glock pistols for approximately $1,500 each and demonstrated one firearm's functionality as a machinegun, according to a criminal complaint filed in the case in October.

All of the machinegun conversion sears in Navarro’s possession lacked serial numbers and were of unknown origin, according to the complaint.

Navarro was arrested and transferred to the Kaufman County Jail on a federal detainment contract and ordered detained pending trial.

“This defendant attempted to circumvent our nation’s gun laws by converting legal firearms into unlawful machineguns,” stated U.S. Attorney Nealy Cox. “Machineguns have no place on the streets of Dallas. Using federal firearm laws to reduce gun violence is among the Justice Department’s highest priorities.”

“When firearms and drugs can be readily obtained in an underground market, the challenge of reducing violence in our communities is much greater,” stated ATF Dallas Field Division Special Agent in Charge Jeffrey C. Boshek II. “Individuals who bypass regulations designed to protect our communities fuel the devastation possible when firearms end up in the hands of prohibited persons as well as impede justice for the victims.”