Yep. The bearing pushes up against it and if it turns it won't turn the nut and sheer the cotter pin.
If you made that over here you’d be eating three square meals a day curtsy of Her Majesty detained in one of her luxury long term secure hotels :)
It's PVC plastic, and doesn't fire anything. Full size model. Took me about 45-50 hours of intense effort to make it.
Soon to be seen next to a large sign out front that says:
SERIOUSLY... Get off my lawn!
Looks like a useful little anvil.👍
Now its too pretty to use and ding up.