Yes Gordon, that one does indeed appear to be a converted flint, however it is missing the pivot hole for the frizzen screw & 'feather'(frizzen) spring screw hole.

Also odd the platinum plug has no tiny hole in the middle.

Nice find, but very strange indeed. They sure did a nice job on the conversion.

Careful about the 'tubes' as being soft steel or barely hard iron, they oft times had worn out orifices or non-existent 'choke' points in them. This will cause excessive pressure on the hammer & main spring.

Nice fences - VERY good work was done.

The hammers would seem of the 1840 period or a bit later. This conversion could very likely be from 1850's or 1855 even. Good quality flintlocks were not quickly converted to cap ignition as the early cap systems were far from being 'better' & caps, especially good caps were not in evidence or easily avaiable for the 'hunter'. Quality of parts and systems took time and I think the first viable cap-lock system was invented about 1820, maybe 21, commercially and was a far cry from what they evolved into in the next 10 to 20 years. That is the style I feel, of the hammer, quite late, looking almost identical period in hammers and fence, to my brothers Joseph Lang 16 bore single shot rifle, made in 1853.

Again, a very nice gun, quite an early one and a gun well worth having.