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Hi Henry and welcome. Yes Sir : pretty much any mag that fits the G21 will work (will extend past the grip proportionate to size) : https://themagshack.com/product-category/pistol-magazines/glock-30-magazines/ - Cheers and stay safe!

Henry, the Glock 30s will accept magazines for the Glock 30 and Glock 21. They do make a sleeve for the 13 round Glock 30 magazine for this to fill in the gap. The Glock 21 mags will fit but will extend past the grip. If you want a flush fitting magazine unfortunately 10 rounds is the highest capacity. If interested here's a link to a 18 round magazine that will fit...................... https://www.budsgunshop.com/product_info.php/products_id/117692/ets+group+glk-21-18+compatible+45+acp+for+glock+213041+18rd+clear+detachable ......................... And here's a link to a 22 round magazine that will also fit......................... https://www.budsgunshop.com/product_info.php/products_id/125120/promag+glka17+for+glock+compatible+45+acp+2130+22rd+black+detachable ....................... Both are for the Glock 21 so they will extend past the grip a good bit. Hope this helps.