A 21-year-old Brooklyn man has been arrested and indicted on 73 firearm-related charges for allegedly manufacturing and selling untraceable firearms known as ghost guns, according to the district attorney's office.

Martin Streich was taken into custody Tuesday following an investigation into his alleged activities over a three-month period. Prosecutors say he manufactured and sold eight ghost guns during this time frame, including two weapons classified as assault weapons.

Ghost guns are firearms that lack serial numbers and are typically assembled from kits or parts, making them difficult for law enforcement to trace. The weapons have become a growing concern for authorities as they are often used in crimes and can be obtained without background checks.

The charges against Streich represent one of the larger ghost gun cases to emerge from New York City, where officials have been cracking down on the illegal manufacture and distribution of such weapons. The investigation that led to his arrest was not immediately detailed by authorities.

Streich's defense attorneys have indicated they plan to challenge the evidence in the case, though specific details of their legal strategy have not been disclosed. The case is expected to proceed through the court system in the coming months.