thank you for the video. that's a nice 300. mine is pretty rough. i had a 600 once and shot the spring cap across the room when i was cleaning it. you could probably really take your eye out like a red ryder.
I have one my Dad brought back home from WW ll that I've had for years and always wondered why the model # isn't stamped on it. It's chambered for 9mm kurz and .380