Don't worry about those who condemn you for asking. I collect blueprints as well and have compiled a fairly large collection. I would post the prints but I'm somewhat worried about copy write laws. I personally do not have the machinery to complete a rubber band gun but it doesn’t stop me from searching for there blueprints. I have designed several guns on my CAD and the blueprints I have downloaded has given me an understanding of how they work. Now say I am a free man 3 times and don't follow stupid laws. As this is the way of an American Patriot!!!