When you chamber the first round the trigger goes into AS mode and then the following trigger pulls are in SA. How does the gun know its the first round? Is there some kind of mechanism that detects when the magazine is removed and then resets to AS mode when the slide is charged? If you fired all but the last round and then removed the mag and reloaded it, after firing the last round from the first mag would the gun revert to AS mode for the first round of the new mag?