I think, and it's been a while since I have been in one but the thing is designed to not fire out of battery. So if you gently close the bolt by holding the operating handle as it closes so that it won't slam shut. It will not fire and will act just as you are describing. The tech term for that is riding the bolt. Try just letting the bolt zing forward on it's own I bet it will fire. It's only human nature to want to treat the thing gently after all its sort of a distinguished old gentleman. But it was made to be a war machine and that's still whats in it's heart let the bolt zing forward and enjoy the ride.