A Somerville man is facing charges after police allegedly discovered numerous “ghost guns” and firearm parts in a raid on his home Friday. U.S. Attorney's Office

A Somerville man is facing charges after police allegedly discovered numerous “ghost guns,” firearm parts, a 3D printer, and a workbench in a raid on his home Friday, federal prosecutors said.

Robert Butland, 38, who was convicted in 2017 of assault and battery on a police officer, among other charges, is charged with being a felon in possession of a firearm, according to court documents. He made an initial appearance in federal court in Boston on Friday and was ordered held pending a detention hearing on Wednesday, prosecutors said.

Authorities obtained a search warrant for Butland’s home Thursday after an investigation

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