The pictures above show the brass framed Spiller & Burr along with the steel framed .36 cal. Whitney.
Although the Confederate contract for revolvers stated they should be like the Colt Navy, the pistols produced were anything but.
A man named Samuel C. Robinson in Richmond, Va. had been tooling up to produce a copy of the Whitney and Spiller & Burr rented his factory and appearently bought his plans for the Whitney copy.
The first, and all later revolvers produced by Spiller & Burr was a copy of the Whitney.
Although the Confederate contract called for a Colt look alike, they accepted the alternate design.
I think it interesting that although the Confederacy was never in good financial shape, the brass pistols were to be electroplated in silver.
Some say that requirement reflects how far from reality some of the Confederates were at the time.
It's just my opinion because I wasn't there but, I believe the Robinson (later to become the S&B) was always intended to be a brass framed pistol.
Note in the pictures above, the frame in front of the cylinder is considerably wider. This (IMO) was to compensate for the use of the weaker brass material. The area provides a much larger amount of brass to strengthen the area where the barrel threads in. (The original Spiller & Burr pistols had this same, wider area.)
The reproductions are quite good representations of the originals.
Perhaps one area that was copied should be mentioned.
The loading lever/barrel pin retainer are like the originals.
IMO, they leave a bit to be desired.
The loading lever/barrel pin retainer is the twist knob on the left side of the frame. Turned one way, a notch cut thru the knobs shaft aligns with the barrel pin allowing the lever/barrel pin to be removed.
Turned 180 degrees in either direction, the clearance cut rotates out of alignment with the pin and this retains it.
The entire force of the loading lever goes into this half shaft which makes the whole assembly rather weak.
Also, the ram attaches to the loading lever thru a very small screw.
This tiny screw must take the full force of the loading ram and it doesn't take much to break it.
I'm not saying, "don't use the loading lever". I am saying, loading balls much larger than .375 in diameter isn't a good thing and loading elongated bullets which require a lot of force to load them into the cylinder should be avoided.
Also, like all brass framed cap & ball pistols, keep the powder loads on the mild side.
Although the rear of the cylinder has a much larger surface area recoiling against the brass frame than the Colt's small recoil surface serving the same function, it is possible to damage the frame with heavy powder loads.
I suggest a powder load of 18-22 grains of 3Fg or Pyrodex powder.
Another tidbit of information: Like the Remington, to replace the cylinder into the frame, gently push the cylinder into place, stopping before it is entirely inserted. The cylinder hand, protruding from the rear of the frame will be blocking it.
Rotate the cylinder clockwise (looking from the rear). This will push the hand back into the frame so the cylinder can be pushed into place.
Following the insertion of the cylinder pin/loading lever be absolutely sure you turn the retaining knob a full 180° (half a full turn) to fully lock the pin in place.
Some of the internal parts are taken from the modern Remington Army reproductions so some parts are available for the S&B.