At first glance, the photo above looks real, but your eyes deceive you. The picture is actual a fantastically detailed computer rendering of a cut-away AK-47 by DeviantArt user ABiator.
Taking it a step further, ABiator has cut-away drawings of the venerable 1911, Multiple Grenade Launcher, & a Mosin-Nagant. With my eyes, they are near indistinguishable from real photographs.
Downloadable desktop wallpaper-sized copies (1920×1200) are all available on ABiator’s profile.
UPDATE: The models in this gun are from the Gun Disassembly 2 application.