Baikal makes .45/70 inserts for their IZH 43 (Bounty Hunter) shotguns - actually, the shotgun is made by Baikal and Tanfoglio makes the inserts and both items are distributed by EAA...
Anyway, it's really quite a nice set-up! The shotguns themselves are a very nice item (I own two!) and sell for about $200. The inserts go for $140 each, so you're looking at $480 for the entire package.
You have to regulate the inserts yourself, but once adjusted you can just take them in and out without having to re-regulate them. So, you can use it as a double shotgun or double rifle, OR, with one barrel of each...
The inserts come with an Express Sight that needs to be drilled and tapped into the barrel.
The poor mans double rifle! And a .45/70 qualifies as a dangerous game rifle, I'd think!
These Baikal shotguns are a real bargain as far as I'm concerned (with or without the .45/70 inserts). Nice wood, faux engraving, tight - nice!
Keith