WILLIAMSBURG, Brooklyn — A man was robbed at gunpoint while he was getting a haircut at a Brooklyn barbershop, police said. As the 30-year-old victim was getting a haircut inside a barbershop along Maujer Street on Oct. 14, a man with a firearm demanded his property, authorities said. The victim complied, and the suspect fled with $350, a credit card and a cellphone, police said. No injuries were reported. According to police, the incident looked like “a crime of opportunity,” and picked the victim, who was seen driving to the barbershop in a nice vehicle.