Re: a5 broken down
That spring is intended as a carrier detent, to keep the carrier up or down depending on the action at the moment; the carrier is intended to stay in one place, up or down, until it is moved. Now let me see if I remember.
When the gun is fired, the bolt comes back and trips the dog, which raises the carrier. The carrier has to stay in the up position, with a shell on it. As the bolt comes forward, it chambers the shell on the carrier, then the link trips the dog forward and drops the carrier to pick up the next shell. Again, the carrier has to stay down until it is raised.
So it sounds like the carrier is working the way it should out of the gun, staying up until forced down and vice versa. Cleaning never hurts, but dirt or carbon seldom affects that operation as the parts are big and well out of the way of most firing crud.