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The earlier ones have a slotted barrel nut that you can get a spanner for. The newer stuff has a smooth barrel nut that requires a more complicated and expensive tool.

+1

I was after a spare mag and a couple of other bits, for an exta $50 I bought an entire second rifle.

You looking at the Savage as a base for the switch barrel ebf? Would be a good candidate...

I don't think an 08 mag will hold 223 rounds.

ebf

There are different mags for the 08 and 06 family of case. All in the same family share the same mag. There is no spacer.
Photos show loaded 243 round in the 243 mag and an empty 270 case in...