Did da vinci invent the sniper rifle?

Technically no. According to documents provided by the Duke of Milan, Ludovico Sforza who had hired Da Vinci to invent weapons of war, Da Vinci custom built a wheel lock musket with a telescope bolted along the barrel. In the Duke's documents, Da Vinci demonstrated its effectiveness by shooting soldiers off the parapet of a castle 1000 yards away. Rifling in mechanical sense was not invented until 1520, a year after Da Vinci's death.