I watched a Paul Harrell Youtube video recently on how to spot a firearms expert and I watched his earlier one on how to spot a fake firearms expert. Sure enough this weekend I went to a local gunshow and took my SBR'ed Glock just for the hell of it. I didn't get two tables in when I had random strangers tell me my Glock with the stock and foregrip was illegal. I carry a copy of my NFA paperwork whenever I carry any of my NFA items. Most people realize their mistake and it usually ends up in a discussion about NFA items, misconceptions, and NFA rules. One stranger who claimed to be in law enforcement (he didn't say what dept he worked for if any) told me my SBR was illegal and I was lucky he didn't confiscate it and run me in. But since it was the weekend he didn't want to fool with any paperwork so I was going to be let off with a warning and I needed to take the stock and grip off immediately. When I showed him my NFA paperwork he stated that it was fake and that I still needed to remove the items. I took out my phone, snapped a picture (which freaked him out), and told him I was going to call the sheriff's office to settle the matter. I'm pretty sure he left skid marks on the floor with how fast he left the show.