Detectives arrested the alleged teenage gunman Thursday whom, they say, cut down a Harlem grandmother with a stray bullet fired from a machine gun during a brazen daylight shooting last week.

According to police sources, 18-year-old Faisil McCants has been charged for allegedly firing the bullet that killed 69-year-old Robin Wright.

Cops say McCants was one of three men who attempted to rob a man as he slept on a lawn chair on the corner of 109th Street and Madison Avenue in front of a deli at around 12:22 p.m. on Aug. 27. Police sources said the men, donning face masks, reportedly asked the victim if he “sold weed” before demanding all of his possessions. They then snatched his backpack containing marijuana before making a run for it.

However, law enforcement sources reported, their vi

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