My buddys smith and wesson needs to be racked before the trigger becomes "active" (IE the hammer drops). Yet on my sig p226 the hammer will always drop regardless if the the gun is racked. both guns are DAO. So what am i missing here? Whats thr term and or feature that the sig has and the smith and wesson does not? And why wouldent all manafactures use the system sig has? It just seems to make more sense.