Here's an interesting photo that was posted on an AR-15 site many years ago. Wonderful art and food-for-thought.

Doug Napier writes: "The camera was a Golden Engineering Inspector, shot at about 5 feet on polaroid transparency film. Exposure was about 45 pulses, as I recall (the batteries were weak). The real film image is actual size, so my full-size scans are, well, full sized (and amazingly detailed). It's a tough x-ray to shoot...enough power to see through the bolt carrier or into the chamber, and the aluminum parts wash out. The image you see is a pretty fair compromise, I think, and is the result of several hours of work. Since the original is a tranparency, if you hold it up to the light a lot of the detail that you lose on the flatbed scanner is apparent."