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Hi Joseph and welcome. I would get accurate firsthand information from North American Arms Customer Service at 800-821-5783 or by online inquiry to: info@northamericanarms.com -------------- Cheers and stay safe!

Hi Joseph, no sir, the firing pins are different. Although it is built on the company's .22-LR frame, the rimfire models have a hatchet-shaped firing pin mounted to the hammer while the Companions have a spring-loaded, frame-mounted firing pin. The rimfire cartridge Mini's rounds are struck on the edge of the rim by a blade. The Companion's use a transfer pin to deliver a centerfire blow to a percussion cap. Stay safe & have a great day!