Well my Father-in-law (or soon to be) gave me a new Stag AR-15 for graduation. It is very freakin cool. However I was messing around with it and discovered that if I lock the bolt back and give a medium hit to the butt of the rifle, the bolt will release and go forward, without ever touching the bolt release. Is this normal or a weak bolt hold open spring? Second, I noticed that I can pull the trigger and the hammer will drop even when the bolt is not fully in battery. It can be almost 3/4 of an inch from being fully forward. Is this normal? Does the AR-15 have any mechanism to prevent the hammer from dropping until the bolt is completely forward? I am asking because I know that a 1911 will not fire if the slide is not completely forward.