Ya know, I have a pretty unsatisfactory answer, that hopefully educates without screaming Theater in a crowded fire.
Most commonly the sales drone pulls out the (usually) handgun and if a revolver, hands it to me, if an auto perhaps racks the slide/bolt, runs it forward with magazine inserted, and hands it off. Possibility 1: Pistol, it's in a safe direction. If so, I happily make a minor "show clear." Slide lock back, pull magazine and show drone it's clear. You know the drill. They usually are a bit abashed. Possibility 2: Revolver, again open the cylinder, show clear, etc. Possibility 3: ANY firearm, NOT pointed safely, regardless of being cleared properly, I kind of gently suggest "Muzzle!" and point to a safe direction. Of course regardless of possibilities, it works in reverse. When I'm done, I properly show clear and hand it back with muzzle in a safe direction. Good for goose, good for gander.
eh, I'm not out to cost a drone their job. And if I can impart a little education, maybe they'll have a few more sales. 1 opportunity to learn is it, though.
-jb, shoot me once, shame on you; shoot me twice, shame on me [j/j obviously]