Pardon this necro-post, but you seem to be the freshest source of data.
I have the Lone Eagle (Ordnance Tech) in .30-06, and swiss-cheese muzzle-brake.
I then successfully bid on the .444 Marlin set-up, and it seems to have no rotary-
breech parts with it. Bore is very sharp and clean, and my quandary is, "Does
the breech / firing-pin / extractor etc. somehow dismount (screws, pins, etc.) from
the one barrel and mount onto the other?" If not, are breech-parts available
anywhere? This later, long-stock model L.E. shoots 30-06 like they were .22 LR,
except for the muzzle flash!!! Thanks.