This base is a replacement for the base used in the MagGuts 12 round magazine conversion (Part #CVN039) for the Standard P365 12 round magazine. Must be used with MagGuts spring and follower. Not compatible for use with original Sig Sauer spring and follower. Not compatible for use with X or XL models. Use with Original P365 12 round magazine that uses Sig mag sleeve only.
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