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Hi James and welcome. No, you cannot simply switch calibers or modules on a Kriss Vector stock by swapping parts from another Vector; the Vector platform is not designed for caliber conversion, and changing the caliber of a Vector requires a complete receiver replacement, not just swapping the stock or upper assembly with another Vector of a different caliber. Cheers and stay safe!

No cross caliber compatibility with the Kriss Vector without a complete receiver swap out.