A Biddeford man faces charges of robbery and criminal threatening after he allegedly stole a bag of marijuana during a drug deal while wielding a replica of a gun, police said.

Police were called to Red Rocket on Birch Street at 9:17 p.m. for a report of a man pointing a gun at the caller.

Police were told that Henry Williams Jr., 19, sold a small amount of marijuana to Michael Picardi, 26. Picardi allegedly pulled what appeared to be a gun from his waistband and took the drug without paying for it, police said. One of Williams’ friends followed Picardi, who at one point pulled out his gun and pointed it at the witness, police said.

Picardi told police he was followed and threatened with a gun.

During a search, police found the marijuana in Picardi’s possession and then found a BB gun, a replica of a Walther PPK, tucked into his boxer shorts, police said.

Picardi was charged with robbery and criminal threatening with a dangerous weapon and is being held at the York County Jail on $5,000.

Williams was charged with trafficking in marijuana and is being held on $1,000.

David Hench can be contacted at 791-6327 or at:dhench@mainetoday.comTwitter: @Mainehenchman