Local, state, and federal authorities have charged an alleged black-market gun dealer with unlawfully selling a high-capacity firearm with an obliterated serial number to a cooperating witness, Suffolk County District Attorney Daniel F. Conley said today.

HERBERT DAVIS (D.O.B. 6/27/59) was arrested in his Harold Park apartment yesterday minutes after he was allegedly caught on tape selling a 9mm semiautomatic Intratec Tec-9 firearm, a 30-round magazine, and half an ounce of crack cocaine. Davis’ daughter, DEDREA POINDEXTER-DAVIS (D.O.B. 5/13/65) was also charged with possessing additional crack cocaine recovered inside the residence.

“This is another example of the gun and drug nexus that fuels violence in Boston, Suffolk County, and Massachusetts,” Conley said. “Local, state, and federal law enforcement are committed to reducing that violence at its source.”

Assistant District Attorney Rebecca Corke recommended that Davis be held on $250,000 cash bail on charges of unlawfully selling a large-capacity firearm, unlawfully receiving a firearm with an obliterated serial number, possessing a firearm with a defaced serial number in the commission of a felony, unlawful possession of a firearm, possession of a Class B substance, possession of a Class B substance with intent to distribute, and violating the state’s drug laws in a school zone. Judge Shannon Frison set bail at $50,000 cash bail and granted Corke’s motion to revoke Davis’ open bail on an unrelated case out of Norfolk County.

Poindexter-Davis was released on her own recognizance on charges of possessing a Class B substance.

The two were arrested yesterday amid an ongoing investigation by members of the Boston Police Department, Federal Bureau of Investigation, and the Suffolk DA’s Narcotics Unit into illegal firearms sales. In the course of that investigation, a cooperating witness had made arrangements to purchase from Davis an AR-15 rifle for $3700. Yesterday, when the witness brought that amount for the rifle, Davis allegedly increased the price to $4300 and offered the witness the Tec-9 and crack cocaine instead. The witness accepted the deal.

Minutes after the witness left Davis’ apartment, members of the Boston Police Department SWAT team entered and secured the premises for the execution of a Suffolk Superior Court search warrant. Investigators recovered $3573 in cash from Davis’ person, as well as two plastic bags of crack cocaine, a quantity of white powder believed to be used as a cutting agent, and $389 in cash.

In the course of the search, Poindexter-Davis allegedly stated that the crack cocaine belonged to her.

Both defendants will return to court on Oct. 20.