Car running Hot

Before you make any decisions based on the "temp gun" readings, you might want to measure with something else. I assume your "temp gun" is an optical type. They don't directly measure temperature, but rather the emitted infrared light. The reading depend on the emissivity of the surface (black vs white or reflective). A contact type sensor (thermocouple or RTD) would be more accurate, perhaps a cooking thermometer. If the top of the radiator is actually 130 F, you could hold your finger on it for several seconds.

If the temperatures are correct, then no coolant flow, which means either a thermostat stuck-closed or bad water pump. I have heard of water pump impellers coming off or the shaft breaking just before the impellor, though have never seen it. As a young child I recall a highway worker looking in the radiator cap of our 63 Valiant Slant Six which was over-heating and said "no water flow, must be a stuck thermostat", which proved true and he fixed in 5 minutes. I can never see the water flowing, so maybe those old radiators didn't have a baffle at the top.