My second pair - Sig Sauer X-Macro Extended Sig Sauer P365, 9mm Luger, 21 Round Pistol Magazine

I bought two X-Macro ext. SIG P365 mags from Optics during sales. The shipping and order process was smooth and on point. This mag didn't jam on me during the shooting range. However, you make sure the rounds are seated properly. It does stick out compared to 17+ mag. However, I like 21 EXT because it has room below my hand grips, and knowing I have an extra 4 rounds to put down range. If you place the mag behind your kidney area, it will provide good concealment. I highly recommend factory version of 21 Rd mag.