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you can use the 12 rounders that came with your standard P365 with the XL grip module.... you would just have to change the baseplates to the flush fit style... about 10 bucks a piece from the Sig store
www.sigsauer.com

12 RD P365X and P365XL FLUSH FIT FLOOR PLATE
Use this floor plate to convert a P365 12-round extended mag (MAG-365-9-12) to a flush fit 12-round P365X and P365XL magazine. Magazine not included.
