Yeah, you are correct, this is what we used, and during filming that wouldn't look good yeah. I remembered these more like a safety precaution - although sometimes some managed to fire off one of those. Probably we were talked about that how they help reloading for blanks, but I didn't remember.

Then there were also machine guns we fired blanks with, I don't remember if we fired live ammo also from machine guns or whether they also had nozzles. Actually, never mind, I think we did also do target practice with machine guns.