Strawhat,
If cap jams were not a concern, can you explain why some Manhattan(or the very similar Bacons I forget which) went to the trouble of patenting and manufacturing a system to protect their basically colt rip off actions from cap fragments? Basically it was a light flexible steel shield between the hammer and the nipple being struck and between the back of the cylinder and the breech face ( with its hammer opening) of the revolver.
I also rather liked the seemingly much more secure safety arrangement of the Manhattans they had extra bolt slots on the cylinder so the hammer rested between caps AND the cylinder was locked to prevent turning even if dropped.
There is one for sale on GunBuyer.com at the moment, but you seldom hear about them. This one has been "Reserve not met" for a couple of years at least. It is a first model navy (they made a few thousand in 1860)and has no cap guard.
For the nth time let me say I wish someone made an affordable copy of the Kerr from London Arms Company. Almost the entire production went to the CSA (Some say THE most imported revolver of the war in the South)and yet one scarcely ever hears of them.
-kBob