The P365 is designed as an every-day-carry pistol while still retaining usable and reasonable magazine capacity. The magazines for this pistol are exceptionally well made just like any Sig Sauer product. This intermediate-sized magazine has a ten-round capacity while also featuring a small grip extension. Useful as a spare magazine when carrying the pistol this mag can be carried in a pocket or bag so that if needed you have a small extended grip to use. Shooters of concealable weapons know how valuable that extra grip surface can be. The p365 ships with a magazine of this size as well as one flush magazine with no grip extension.