phrn said:is the number of moving parts important? when one breaks, the whole system goes down!!!!!!!!!!!!!!
Yes! With each additional moving part, there is the risk that the part may not move or if it does, it will move in the wrong way or may interfere with another part. My vote goes for a single shot, or put two singles together and call it a double with two triggers. Hey if one side fails you have a good reliable single left. Change the order! Double first and make it a box lock.