RobD advice is a good starting point but if its not serialed to the rifle then is the bolt fitted correctly! As they are not plug and play like say a Barnard action think one of the more experienced here said they are a helical lock up with certain points needing to engage equally to be safe. One wonders if the barrel has been replaced by a bubba and the action has been slightly twisted as PL said they twist like spaghetti if you set it up wrong with the incorrect gear. PL also suggested using a slave bolt in the action whilst doing the barrel change I seem to recall.
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