M60 in Shoreside Vale
There is an M60 at the airport parking lot. There should be a small opening to your left. When you go through it, there is a ramp going on top of the fire station. To your left when you are up there is a ledge going around the airport. There is a secret package and magnum. Keep going around the airport until reaching a dead end. There is a small gap between the edge and an airplane hanger. Drive of the edge onto the airplane hanger to find an M60 with 100 ammunition.