Ah...... Preacherman...
If you look at any of the original Colt cap & ball revolvers, as well as most of the replicas, you may notice that the following parts carry the serial number.
Frame
Cylinder
Barrel
Trigger Guard
Backstrap
Stocks
Barrel Wedge (sometimes)
Bullet Rammer (sometimes)
Cylinder Arbor (sometimes)
The reason for this is that these parts were not intended to be interchangeable between guns, and were individually fitted to one frame. The numbers insured that the right parts would get put back together after they were finished (blued, case hardened, plated, etc.) by the final assembler.
Now it is true that you'll see an occasional mis-matched cylinder, barrel wedge, or backstrap/trigger guard - but on the
part of the Colt company (pardon the pun)
this wasn't intended.
Octagonal barrels were not optional. They came standard on those models that featured them, and were not offered on other models. Excluding the Walker and Dragoons, that had half-octagon/half round barrels, and 1855 Sidehammer Pocket Model, the round barreled models were introduced during or after 1860.
And for those who simply must have a genuine Clint Eastwood G,B & U revolver, go to
www.cimarron-firearms.com where a Uberti-made duplicate is being offered. Remember to bring money...