Detectives are investigating after an unhappy customer shot two store workers in Queens on Saturday evening.

According to police sources, the incident unfolded inside the “Great Savings” store located at 149th Street and Jamaica Avenue in Jamaica just after 5 p.m. on Nov. 15.

Cops say the fuming gunman walked into the store and opened fire on two workers there. One of the workers, a 55-year-old man, took a bullet to his right thigh, while his 34-year-old male coworker was hit in the left side of the chest.

Sources familiar with the investigation say that the shooter had been in the store earlier that afternoon and had argued with both workers over receiving money for a return. When he did not get his way, he left and returned with a gun.

Officers from the 103rd Precinct responded to th

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