Yeah, Producer titles without any responsibilities are included as part of compensation packages all the time. Sometimes they’re assigned because talent is helping fund part of the movie or consulting on some specific topic, but otherwise not involved other than as talent.

Talent is not expected to know everything about every prop they are handling, that is someone else’s job. They are informed of what they need to be careful of either by a prop master, or the armorer. If the armorer is sending out a weapon saying it is ready for set, then talent will expect it to be in the state they have been educated about in advance.