Greetings Loyalist: Your barrel appears to have a spacer at the receiver, this is typically done to match a barrel shank to an unmatching receiver thread or to re-chamber to a larger/longer cased caliber. The stock in-letting at the receiver and barrel junction looks very wide by Rigby standards, where the shoulder flare for the chamber area was originally can be seen. That being said, I'm sure you got good value for your $400.00 in the peep site alone.