I totally agree with you, but the way that I see it is that perhaps the guns don't even use traditional bullets as we know them now, and therefor the system on which the guns operate works differently. like... scout rifles loading under the trigger, and feeding behind the bolt and chamber. although I am far more intrigued about how a sight can effect my reload speed. or how my gun can regenerate grenades when I kill something. with hand cannons, I don't think that they are revolvers in any sense of the word. you put a small cylinder in the middle of the gun... like a power cell of sorts. no visible bullets. so the hammer may have an entirely different (aesthetic?) purpose, or at least may not need to hit any kind of primer on a bullet casing like a traditional gun.