Mountain Bike Sizing

Looking to get a mountain bike off of Craigslist, but I have a quick sizing question. This guy has 2011 norco shore that is basically new but he says it is size small. He says it's a little small for him and he is 5' 11" , 175 lbs. I'm 5' 10", 165 lbs. is this too small for me?
 
I'm 5 11 and I ride a medium, which is about right for me. I would say a medium would be ok for you too, definately dont go with a small. But we need exact frame measurements to be sure.
 
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