Based on the text in the original post, I’m guessing that table ruled that the transformation took enough time for the ball to exit the gun. If not, mounting the ring out a little ways from the end of the barrel is an easy enough solution.
Your ‘timing’ thing would probably work, but if not, mounting the the ring away from the gun would only protect the gun, not the ring. I could see a timing or slowed effect could allow the ball to pass through before it expanded
Based on the text in the original post, I’m guessing that table ruled that the transformation took enough time for the ball to exit the gun. If not, mounting the ring out a little ways from the end of the barrel is an easy enough solution.
Your ‘timing’ thing would probably work, but if not, mounting the the ring away from the gun would only protect the gun, not the ring. I could see a timing or slowed effect could allow the ball to pass through before it expanded