Rifling

This work by Adam M is licensed under a Creative Commons Attribution-Noncommercial-No Derivative Works 2.5 Australia License.

Looking down the barrel of a gun, son of a gun.

Pentax K-x - 1/160 sec - f/? - ISO 6400 - ~27mm

Daylight, indoors.

Used GIMP to crop, scale and watermark.

Its really quite abstract. Focusing on rifling is not easy. Even searching google images and flickr for "rifling" didn't turn up anything much better than what I was getting (flickr search was really bad actually, turning up stacks of rifles, but very few showing rifling). I'd be interested to try again with a tripod, a narrow lens, and a really tight apperture. Maybe even focal stacking? Perhaps that wouldn't actually make it better...
Oh, and that's not actually an eye in the middle. The bolt had been removed, and I was pointing the camera down-barrel toward a wall (I'd initally been shooting (camera angle, not the gun) out the screen door, which was giving a blown out center and interesting lighting on the rifling).