[KMAX]

One of the things that I like about DA/SA semi auto pistols is that a round can be chambered and the hammer lowered, then fired simply by pulling the trigger. Are there or have there been any semiautomatic rifles with this type of trigger mechanism. I have seen rifles and carbines with revolving cylinders and hammers, but do not know if they are da/sa or sao, but have never seen a DA/SA hammer fired semiautomatic rifle. I wouldn't particularly want one, just curious.