If memory serves none of those were used in inception if that's what your referring to, so no it's not the props room even if it was that's a ridiculous set up and doesn't look like the any prop/replica room I've seen.
In all likely hood they are either photoshopped or airsoft replicas, there's no way dude could get away with owning half of those. Unless he's pappy is yakuza which would explain everything.