TRENTON — A city man who was arrested during Operation Gravedigger, a State Police investigation of illegal gun trafficking along Hamilton Avenue, was sentenced to five years in prison today.

Jameel Harris, 32, pleaded guilty to second-degree unlawful possession of an assault weapon in March. He will have to serve three years before he is eligible for parole, Superior Court Judge Mark Fleming said.

Harris was arrested and charged after he sold a sawed-off Olympic Arms AR-15 semi-automatic assault rifle for $1,200 in May 2012, police said. Prosecutors said the sale also included a large-capacity magazine loaded with 84 .223 rounds.

The five-month-long Operation Gravedigger investigation concluded last August with the arrest of 11 Trenton residents. Undercover detectives and operatives asked the weapons sellers to meet them on Hamilton Avenue near Columbus Park to complete the sales, prosecutors said.

“It’s hard to overstate the harm that can be inflicted with an assault rifle of the type the defendant sold, loaded with 84 rounds,” Attorney General Jeffrey Chiesa said in a news release. “We will continue to work aggressively to lock up those who traffic guns into violence-torn communities like Trenton.”

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