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Corey, this will lock in and function in the G0sf but will extend past the grip of course. The extended magazines will work also : https://www.budsgunshop.com/product_info.php/products_id/718006996/21+26rd+magazine+45+auto+for+glock

yews that will fit and work just fine as will all of these https://gunmagwarehouse.com/magfinder/glock-21?msclkid=2e1025ba2eaa123184fe44c37bdb8437 there they have a 30 round mag and a 40 round drum magazine