To be fair, I've had this thread on my mind for the last few days. Please do NOT take anything I say as legal advice. I am NOT a lawyer, nor qualified to give legal advice. If you have a question about it, consult one. Or read the NFA handbook and the ATF code of regulations and decide for yourself. http://www.atf.gov/publications/firearms/
I will tell you that the last 20 years of precedent has been that you can handle other people's cans as long as it doesn't leave their presence.
I will tell you that the last 20 years of precedent has been that you can handle other people's cans as long as it doesn't leave their presence.