i was at a local indoor range today to shoot my krinkov. i have shot this nfa weapon and other nfa weapons their and other ranges before but this time they made me present my atf paperwork for examination before they would allow me to shoot. this was the first time any range has asked to see atf paperwork. i always carry copies with me when i have my nfa weapons outside of my house but i thought that that would only become an issue if in the event i ran into an atf agent while out with my weapons. i thought that the only person that you are obligated to show your paperwork to was an atf agent if asked for it. maybe i'm wrong. any thoughts on the issue? i can't think of any liability that a range would have allowing someone to shoot an sbr that would not exist shooting a full size carbine.