Is the receiver serialised? I haven't held an R93 for a while so I can't remember if they do. If receiver has a serial. I would personally just do that and then have the calibre as whatever one you use the most. Then ignore the barrels as they aren't a major part under the rules as I see it.
Though, I'm just some shcmuck. It probably isn't a bad idea to go and talk to one of the local AOs in person. Go down to central Police station in Chch and see Jason there? I would trust an AO over any of the FSA staff over the phone for that sort of stuff.
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