My 40c pulls constant duty. When on my side out and about it holds the 10rd mag and switches to the FS 15rd at night and just around the house. The larger mags are nice at the range also. Just be sure to practice with the compact mag too, there is a small difference in the feel as well as weight. I also have the larger mag as my reload while carrying.

Adapters run about $10-12, IIRC I got my X-Grips from Top Gun Supply for $12 each.

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Fast is fine;accurate is final