Greg, I have some knowledge of some Remington's, but not the percussion's or the conversions. My thought's when I first saw it was that the ejector looked rather simple compared to the look of the rest of the conversion, I think a factory conversion would have a better ejector design but I can't rule it out.

I have two military issue pistols, one issued during the US Civil War, a 44 Starr, and one issued late in WWII, 9mm Browning Hi Power, I even have a WWII issue holster for it some place (not numbered to the gun) -

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trivia - the Browning has two more screws in it than the 1907 & 1915 Savage pistols and the same number as the Savage 1917.


And this Quackenbush was in the same safe -
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Gene