This guide details how to perform a caliber change on a Sig Sauer P320 using an X-Change Kit, as demonstrated by Rick Marvick from Sig Sauer. The process involves safely disassembling the firearm to remove the Fire Control Unit (FCU) and then reassembling it with the new caliber's slide and grip module. The FCU is the serialized part that remains with the user, allowing for modular caliber and grip changes.
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