USSG lists some rimless cartridges for the SAB92SF,
such as .375 H&H,.416 Rigby and .458 WM. See:
http://www.ussginc.com/pdfs/catalogpg7.pdf
That requires extractors to deal with the lack
of a case rim.

There is a PDF of the .45/70 manual at:
http://www.ussginc.com/Manuals/USSG_Model_SAB92SF.pdf
Take a look at the extractors in figure #20 on page 13.
This rifle does not look like it will withstand much
use at the range or in the field.

The safety merely blocks the triggers. See "Trigger
Block Safety" on pages 9-10.

If the rifle is "regulated" at all, it would be as delivered.
The catalog says it is - Drilled & Tapped for Optics Rail.
There is no recoil pad. There is an - ENGRAVED
WALNUT BUTT PAD instead. There will be an effect on
accuracy when a recoil pad and perhaps a scope are added.

The price is nice, but if accuracy and reliability are
not up to snuff, it is not a bargain. I hope that anyone
who buys one gets great performance, but I'll wait and see.
Being a first adopter can be expensive.