Probably think "Wow, they appear ready for anything."
I don't know to be honest, I might think, please don't let them rob a bank and please God please don't let this be a scene from the movie "Heat." Just kidding. I would definitely be curious and maybe do a consensual contact, and probably even strike up some gun conversation if I could, and make you late for whatever appointment you had since we would be deep in gun talk...
Otherwise I have to say, not sure, depends on the circumstances, and how many soccer moms "felt threatened" ha ha, had to throw that in there.
I have actually never shot one of those so I would most certainly be intrigued. I know a lot of people do things just for shock value too, and I would probably confess that as a fellow gun guy, who prefers concealed, why you do it that way...remembering this is all consensual at this point and more or less just trying to BS with you