I had a Bushmaster Varmint rifle that was not staked properly. I was at the range one day and could not understand why my rifle would not function. I was totally exasperated, I field striped the rifle and the key was so loose I could not believe it. I realized what the cause was and it was restaked, this time much better. Never had a problem after that. It is gone now so I don't have to worry about it.