This is a copy of Captain America #240 printed by Marvel Comics in 1979.
 
"Gang Wars! Plot by Paul Kupperberg. Script and Pencils by Alan Kupperberg. Inks by Don Perlin. In order to help an old man save his house, Captain America gets involved in a fight with a local street gang. The final showdown between Cap and the gang leader, Big Thunder, takes place at the Coney Island Amusement Park!