I much prefer having a good receiver/peep sight on a carbine like the Marlin Model 336, especially when the shots are generally taken at relatively close ranges in heavy cover. The peep sight is way quicker to get a good sight picture with than "factory irons" are and the superb balance and carrying properties of a carbine like the Marlin or a Winchester Model 94 is not adversely affected with a top-heavy, "in the way" scope.