The Swedish Bofors 40mm, an anti-aircraft autocannon, gun was adopted by many countries. It fired a 40mm shell at a rate of 120 rounds per minute. This animation, part 1, shows the firing and loading mechanism. Part 2 should show the basic mounting and explain how the cocking, trigger and latches operate to regulate the operation of the gun. Note that Part 1 is still ’work-in-progress’ and will require some changes, but the essential mechanisms shown are thought to be accurate. Animation created using Cinema 4D. Music credits are shown at the end of the movie.