A Seattle SWAT team busted a career criminal last week after, police records say, the man sold a "cop killer" gun to an undercover police informant.

Late last month, the informant contacted SPD detectives and told them about an acquaintance who was illegally selling handguns. At the direction of detectives, the informant inquired about purchasing a gun from the man, who offered to sell the informant a 5.7mm handgun—which, police records say, "is known to be capable of penetrating body armor worn by law enforcement"—for $400.

The two men met on January 7th—police records do not indicate where the meeting took place—and SPD's SWAT team swooped in and arrested the man. In the man's car, police found fake bank checks, fake proof of insurance cards, "materials used to produce fraudulent checks" and stolen mail, and the names and addresses of the man's associates who "traffic weapons, drugs and stolen mail," which were all stored in a GPS unit in the man's car.

Police interviewed the man at SPD headquarters and asked him about the gun he'd tried to sell. Records say when detectives asked the man "What is so special about the 5.77 mm gun?" the man told them the gun is "known as a 'cop killer' because of the special rounds it fires."

According to police records, the 37-year-old man has 10 felony convictions for burglary, indecent liberties, rape, failure to register, bail jumping, possession of stolen property, theft, auto theft. He is also considered "assaultive to law enforcement" and is a member of a white supremacist prison gang and, prior to his arrest, had warrants for assault and escaping community custody.

The man has not yet been charged for selling the guns, but prosecutors have filed charges against him for possession of stolen property and failure to register as a sex offender.