I haven't yet seen a rifle with the front sight ramp tapered toward the muzzle. I agree that it does not seem logical. But here is a picture of a revolver with the ramped front sight going the wrong way.

http://uncyclopedia.wikia.com/wiki/File:Gun_Backfire.gif

edit: this won't post as a link for some reason so you'll have to copy it and paste it in your browser. Sorry.

Voting for anti-gun Democrats is dumber than giving treats to a dog that shits on a Persian Rug