That clicking device in "The Longest Day", the one that got Sal Mineo killed because a Mauser '98 sounds exactly like it. What do you call those things? Were they really issued to paratroopers on D-day? Can one still find working samples?
It was called a 'cricket' and today, original ones are highly sought after by militaria collectors. There are many repro/fake ones available and TBH I have no idea how to identify a genuine one.
They were available as toys when I was growing up. Most were obviously not originals or even imitations of the military ones.
A movie-ism... A K98 only sounds like a cricket when it's empty and the magazine follower pops up as the bolt opens.
When I saw the title it reminded me of a joke"Clip,clop,clip clop.Bang,Bang,clip clop,clip clop." An Amish drive-by shooting! Sorry for the hijack.