Poorly written poll, but I'll play.
When shooting in an open space, pit, what-have-you, I am ALWAYS carrying a sidearm CCW and when I go down range I ALWAYS sling a rifle over my shoulder. If I'm shooting with someone else, one of us stays behind to watch our weapons from theft.
The last time I was shooting we were there a couple hours and were visited once by a department of natural resources officer, who asked us to clean up after ourselves and weirdly "confiscated" one of our targets - an old aluminum sink, but left all the other targets. The police officer just walked around and browsed our weapons for a few minutes, chatted with all of the shooters briefly, and left.
I honestly don't think they have a clue what they're doing, just making a presence. They didn't even question my friends Short Barreled Rifle (which does have a tax stamp).
To answer the question, when the LEO shows up, I put down my rifles but leave my CCW where it is. If asked if I"m carrying I honestly would say 'yes' but I think they know the answer. Everyone there is carrying and we're shooting a zillion guns.
I don't want to make them nervous by reaching for the gun, I just set down my weapon I'm shooting and greet the LEO politely, answer their questions, and get back to shooting when they are satisfied with whatever brougth them to the range.
I certainly don't want to be shot by a nervous cop because I am carrying my loaded "assault rifle". Cops know that their armor offers little protection from rifle rounds, which makes them quite nervous around rifles. And especially since I would be dead, regardless of the outcome for the LEO.