 Metal Storm reported the first shoulder-firing of the MAUL during tests on 24 April 2009 at its test facilities in Chantilly, Virginia.Metal Storm has created a 36-barreled stacked projectile volley gun, boasting the highest rate of fire in the world.The prototype array demonstrated a firing rate of just over 1 million rounds per minute for a 180-round burst of 0.01 seconds (~27,777 rpm / barrel).