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70 Cal.
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That is the earliest model percussion lock used by CVA when they started in 1971. Jukar sold guns and kits through other importers both before and after CVA started in 1971. There is no stirrup in that lock. It was used with a bolster style breech plug. You should be able to see a seam around the breech of the barrel about one inch from the rear where the metal of the breech plug meets the barrel. The bolster breech plug threads will extend within the barrel about 5/8 inch forward of that seam. You may not be able to extend the ram rod into the the bolster thread area. Most of those barrels were 45 caliber and 7/8 across the flats. (A few lesser known models had round barrels. and other calibers are found but are rare.)