I re-read the original post and based on that limited information I would have detained and then tried to get to the bottom of what was going on with respect to the house and what you three rambo's were doing. I wouldn't have wasted time running serial numbers on firearms. IF there was something else that happened to cause me to wonder what was going on then I might take it further at that point.
But I'm not LE so my opinion probably doesn't matter.
IF you're only upset about him running the numbers, what do you think caused him to do it? Was there more that he said or did that adds to it?
I'm not upset that he ran the numbers, doesn't matter to me the numbers to my pistol are on countless CLEET quals, there was nothing out of the ordinary about the whole thing we stood around and visited until I got tired of being outside without my shades and went back in the house so I don't know why he ran the numbers. He and the other 4 that showed up were cool guys but it just didn't seem logical to run the numbers.