The 1836s that were sent to the states under The Militia Act, especially the Southern states, saw heavy use and varied quality of modification to the percussion system. Most of these pistols which can be identified as CSA will show this use.
Here's a few examples, none even close to the condition of Mark's.
This one is the "easy" to spot Fayetteville alteration. The "S" hammer being a Fayetteville Armory distinction, along with the date range and rarely barrel marks. These hammers are being re-produced now. Use caution on these guns.
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The
N. CAROLINA barrel mark would indicate a state militia act gun. Most don't have this.
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This one was rifled and sighted, the rifling possibly from a broken 1817 Common Rifle cutter head.
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Last, but certainly not least. is a black smith alteration to percussion. An explosion waiting to happen, but it shows hard use.
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This one has a North Carolina ID.. go figure !