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Hi Teofilo, No only 10, 13 or 15 round magazines are available for this model.

I could not find anything higher than 15 rounds I suggest contacting Glock and asking them Phone: 770-432-1202 FAX: 770-433-8719

Yes, the Glock 40S&W Extended Magazine will work or the compatible SGM 40S&W Extended Magazine. The 357Sig is based off of the 40S&W Case and can use the 40S&W Magazines. --- https://www.youtube.com/watch?v=KeoiQL_6Lcg