HI everyone! I am new to this forum

Here is my issue: I have been looking to buy a Nikon FM2 camera for a couple of years now. Turns out a close relative of mine told me he owned one FM2 and was looking to sell the body only. I wanted to ask for advice on buying this sort of camera: what signs of wear should I look for especially? Is it a good idea to have it sent to a specialist to check? Signs of fungus? etc..
I know it's a pretty tough camera but maybe some of you own it and can tell me something about its week spots. Would be very appreciated!