Gun Tests magazine tested four high-capacity 12-gauge shotguns in the November 2012 issue. Here’s an excerpt of that report, used with permission: The test guns were the Akdal Arms MKA 1919 3-inch 12 Gauge, $799; the Kel-Tec KSG 3-inch 12 Gauge, $1075; the Saiga IZ-107 12 Gauge, $640; and a…