First time at the Air Force range in San Antonio, 1970, I got off 2 or 3 rounds and the S&W Model 15 locked up. Tight. Instructor had to play with the ejector rod, then it was fine. I've seen it happen on several other occasions. No mechanical device is perfect. I think what happened was the last guy that shot it didn't ensure the ejector rod was screwed in tight after he cleaned it. No one checked it, certainly not me. Since then I always check it before loading it.
If you want to shoot...shoot...don't talk! Tuco
USAF Munitions 1969-1992