Police Chief Shon Barnes told a news conference that the weapon was a 9 mm gun from Polymer80 — a now-defunct company that was once a leading manufacturer of ghost gun parts.

The 15-year-old arrested after a shootout at food festival near Seattle’s Space Needle over the weekend was armed with a ghost gun with an extended magazine.

Police Chief Shon Barnes told a news conference that the weapon was a 9 mm gun from Polymer80 — a now-defunct company that was once a leading manufacturer of ghost gun parts.