A group of thugs with BB guns peppered a cop with pellets from a perch in a Brooklyn building yesterday, police said.

Several BBs struck the officer in the chest at around 4:10 p.m., while the cop was on foot patrol on Marcy Avenue, near Willoughby Avenue in Bedford- Stuyvesant, police said.

He was treated for bruising and released from Brooklyn Hospital.

Police arrested suspects Angel Santana, 20, Julian Fuarez, 17, Sean Bresnahan, also 17, and Abraham Santana, 19, who were hiding inside a nearby apartment. They are charged with weapons possession, reckless endangerment, assault and resisting arrest. Cops found seven BB guns ditched outside the apartment near a window.