I took the rifle apart and gave it a cleaning, with the screws out it was still tight, so I put it back together and used a pick and a bore light to check to see if the screws interfered with the bolt closing. They were recessed in the threads of the action. I don't know how to get the bolt apart yet, need some youtube time. The safety is still stuck in the fire position, so yes the bolt has to be cleaned inside and I will do that. I can see how to long a screw in the scope mount would interfere with the bolt closing. Thanks guntech you have been very helpful.