I inherited a Remington 572 .22 recently. The lock release (left on trigger guard) is really sloppy and doesn't engage to hold the shell in the chamber. This is the release that lets you eject a shell that has not been fired (similar to a Rem 7600 or 870). It seems like a spring is missing but I've checked the internals against the Brownells diagrams and everything is there including the lock bar spring. Has anyone had experience with this? Thanks.