Mark, from what I know, those rifles would be illegal to have at DCHS, and I believe it is the same for handguns. You could report it too the Sky Forest Ranger station which covers the DCHS area. Unfortunately for anything to be done it basically comes down to the USFS having to catch the offenders in the act. That kind of situation would definitely be uncomfortable to be around. If I encountered something like that I would leave and report it to the USFS when I got in cell phone range on the hike out of the canyon.