As Z13 said in Six. The open barrel will usally be the bottom. If you watch these shooters, and they shoot trap much, at about the 23 or 24 yd line, if they break a weak clay, they will start feeding the upper barrel. This pulls the pattern in at the longer distance. As far as a raised rib on a trap gun, its all about comfort when you are running several hundred to a couple of thousand targets in a day or two. It allows you to carry a more upright position with your neck. Less stress = longer runs.
Last edited by olddrum1; October 10, 2009 at 02:32 AM.