The flying open is the bolts. It is a simple fix but if you would rather not tackle it yourself . . .
James D. Henry Gunsmithing
tccraft1 @ earthlink . net
Shoot Jim an email and describe the problem. I don't know if Jim has a 30-30 throat reamer, I think so but ask. If you decide to have Jim fix the problems you will need to send the frame and ALL of your barrels, he will match all of the barrels to your frame. Yes, I know the barrels are supposed to be interchangeable but in reality . . . Not so much, they should be matched.
All of this will probably be far cheaper than you would think and turn around time is very good. Shipping will probably be more than the work. I recommend Jim's work without reservation, the man is a perfectionist. He won't return a gun until he's happy with the work and I assure you if he's happy you certainly will be.