Most of the conversion cylinders are limited to black powder or cowboy loads. There are problems with bullet and barrel groove fit.
A cap and ball revolver with a conversion cylinder installed is a firearm, removed it is a cap and ball and not a firearm. Modifying the frame for a loading gate is a gray area, if the modification allows you to retrain the use of the cap and ball cylinder your able to go back to a non-firearm. If the mod does not allow the cap and ball cylinder to be used it's now a firearm. At least that's what I was told verbally by a local batf agent.
If you want a open top conversion for smokeless loads get one of the purpose built revolvers. They have a forged frame and the correct barrel groove diameter.
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