PRETORIA, South Africa — A gun dealer told the South African court trying Oscar Pistorius on murder charges that the sports star knew the country's gun-safety laws and what is permissible in dealing with intruders, as prosecutors attempted to show that he was a trigger-happy man with an overzealous interest in firearms. Before the fatal shooting of his girlfriend, the model and aspiring television star Reeva Steenkamp, Mr. Pistorius bought an LM6 semiautomatic rifle,... (GunPolicy.org)