A 15-year-old gangbanger was busted yesterday for shooting an 8-year-old Bronx boy in the shoulder earlier this week, cops said.

Eduardo Rodriguez allegedly sat on a bike as he fired the shot that flew into a Soundview bodega and hit Armando Bigo who was picking out a snack Tuesday night, police said.

The teenager had aimed at a group of thugs clustered around the bodega’s front door. The random violence is part of a long-standing dispute that began when a teen was chased into traffic by a gang, hit by a car and killed, according to Police Commissioner Ray Kelly.

The tough-as-nails kid didn’t even cry after getting shot, the store’s owner said.

A surveillance video shows him looking for potato chips before being struck.

Rodriguez was charged with attempted murder, assault and criminal possession of a weapon.