It looks as though they fitted a new barrel on it. Notice the new sleeve at the base of the barrel. Maybe they were test firing it after the repair/replace. That would explain the high speed photo needed to capture the shell as it left the barrel.
It looks as though they fitted a new barrel on it. Notice the new sleeve at the base of the barrel. Maybe they were test firing it after the repair/replace. That would explain the high speed photo needed to capture the shell as it left the barrel.