A couple buddies and I were on some private property sighting in my rock river AR, his bushmaster and just generally having a good time shooting. The subject of bumpfiring came up so I decided to give it a go to see if I could do it. To my suprise it's a lot easier than I though (although horribly inaccurate). We were down there for about an hour when all of a sudden 4 local police came out of nowhere, two of them just had sidearms, but the other two had AR's with eotech's. They were yelling at us to drop our weapons and put our hands where they could see them, of course we complied immediatly. They said that they had several reports of "rapid, high power gunfire" and came down to check for illegal weapons. After they realized that everything was legit they got interested in what we had, we showed them the guns and let them fire off some rounds. It was at this point one of them said to me, "that's nice, but mine's full auto ". I looked at the reciever and sure enough, it was. I asked him to show me what it would do, but he said he couldn't, oh well. We ended up giving them a ride back to their cruisers that they had parked about a 1/2 mile away. It was a little unnerving to have loaded weapons pointed at me like that, but it ended up being a pretty cool encounter with the authorities.