system
A chat on subreddit /r/NoStupidQuestions
human
Something I heard is that there's not such thing as "prop guns" just guns designated for specific purposes. Something like that anyway.
gpt
A "prop gun" could be a rubber cast if it's just going to be held or visibly stored. Those are cheaper, lighter, and won't get damaged if dropped. I handled one of those on one set back when I was extra-ing.