Flew it today with the machine gun module and was a bit disappointed. Could hardly hear it. After one battery which due to the weight didn't last long, I hollowed out the foam cone on the back of the bomb box module to make it a little louder. It did help, but due to the weight the plane was a dog. 130 grams doesn't sound that bad until you are forced to fly with it all the time. The parachute bomb drop is way more fun. Here is a clip of today with the machine gun unit. For this thing to work it needs to be lighter.