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The New York City Police Department says Ignacio Galvin, 54, and his son are facing weapons possession charges.

Police say that on Thursday, the eight-year-old brought his dad's gun to class at P.S. 107 in Flushing and sold it to another student for $3.50. Investigators say the boy who bought the gun thought it was a toy.

Deanna Zeitner discovered the gun when she looked in her eight-year-old son's backpack after school. She told NY1 her reaction when she saw the weapon was: "Oh my god, this is a real gun – I can't believe this is a real gun."

Zeitner rushed right back to the school, where she called the police with the principal.

"It's horrible," Zeitner said. "I don't blame the child, I blame the parent."

Galvan has been charged with criminal possession of a weapon, reckless endangerment, and endangering the welfare of a child.

Police Commissioner Ray Kelly says that Galvan's son took the gun right off a shelf in their house.

"The father has made statements that he purchased the gun for self-protection. It's a defaced gun, the serial number is scratched off," Kelly said, adding that he believes that a live round of ammunition was found on the floor of schoolroom.

Zeitner says this was a traumatic experience for her and her son, who was questioned by police about the incident and suspended from school for a week for having the gun. However police say that child has not been charged with a crime.

Zeitner said she realizes this could have ended much worse.

"The kid was playing with the gun," she says. "What if went off?"