You could order a rifle and have them fit the shotgun barrel of your choice
P.S. If you deside to go this route i was told they will fit shot gun barrels to rifle recievers but not the other way arround even though the recievers are exactly the same. Federal law says that shot guns must have minimum barrel length of 18" some of the rifles are shorter
Mike that's exactly right but the reason isn't barrel length, it's strength of the reciever. The shotgun recievers (frames) aren't heat treated and aren't as strong as the rifles.
Honestly a short barreled 12ga pump gun with rifle sights and a smooth bore would do everything you need for survival. No need for a 22 barrel if you have shotgun slugs, unless you are trying to hit a rabbit or squirrel at long range, in which case you may need more than a 22 anyway.
If you really wanted a combo, I would opt for a NEF single shot 30-06 with an extra 12 gauge barrel. The 30-06 will take care of the big game, and can be downloaded for small animals. The 12 gauge would work for everything else, including wing shooting.
As for the Taurus revolvers, some are decent quality, some aren't. It's more a matter of consistency than design. Their Raging Bull 454 Casull is a better design and usually better built than the comparable Ruger Super Redhawk, but a lot of Taurus's older products have pretty poor fit/finish. The newer guns are generally decent quality shooters for a reasonable price, if you want high quality look to Freedom Arms or similar but expect to pay 2x to 3x as much.