BCG will not lock back when bumped.

[Bearcatrp]

Have had this 12.5 inch 308 for a good 6 years. Put a AR Gold trigger in it. Sat in the safe for over a year. Brought it back out this year. Started slam firing. Replaced the trigger with the original trigger. Still doing it. Is it the spring thats weak that locks the bolt back or something else? Even when I lock the bolt back, the slightest bump will let loose the BCG. Am assuming its the spring but thought I would post this in case I am missing something. Its a Aero lower and a KAK upper. Appreciate your replies.

[hard h2o]

What condition is the firing pin in? Is it able to slide freely withing the bolt?

[Bearcatrp]

Sorry for the misleading headline. I changed it. When I lock the BCG back to leave the chamber open, the slightest bump unlocks it and closes the chamber. Will be taking it apart in the near future to see if any parts are worn or the spring is bad. Thought I would ask to see if there is another area I should be looking at. Thanks

[Rip Van Winkle]

Check the bolt catch for abnormal wear, and make sure there's no debris under it keeping it from fully engaging. You can visually inspect engagement by looking in the breach.