While viewing a story about Jordan Dorner on Commie News Network, I noticed a slide show showing a pair of officers patrolling the street. It's slide 6 at this page. http://www.cnn.com/2013/02/08/us/lapd-attacks/index.html?hpt=hp_t1 http://i2.cdn.turner.com/cnn/dam/as...alifornia-manhunt-0207-horizontal-gallery.jpg Anyways, unless my eyes deceive me...those carbines have cans on them. Is this standard? Why do they use them? Also, it looks like the officer on the left has the magazine in the weapon (and it appears to be a 30 rounder!) and the officer on the right appears to be holding the mag in his hand. The cop on the right also has what looks like a fairly high magnification scope.