You need to be present at the demo! And one main reason also by Federal Law you would technically have to transfer the weapon to them which takes an unreasonable amount of time and then they would have to transfer it back to you which takes a ton more of time with the NFA Folks. And even if you could you might have another demo but would not have the gun. So even if you did the transfer it technically is an impossible issue. So the answer is go do the demo with them. You must be present with the weapon. Wotrking in the past for a weapons manufacturer as National Rep & Trainer. I kept two complete lower receivers with me. One Semi and One Auto, One Semi Carrier Group and One Auto Carrier Group and one Complete Upper. Of course head space checked OK with both Carriers. Something you might want to consider when demoing. Keeps you from packing two complete weapons around. So you can do a Semi Demo or an Auto Demo anywhere you go and only need one gun case or bag.