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Hi Wayne, this comes with (3) 10rd magazines. Stay safe & have a great day!

This comes with (3)-10 round magazines. Glock 21 . 45 mags will work in the smaller compact Glock 30 in . 45 — they just stick out a bit. The other way doesn't work because the short mags can't insert far enough into the grip of the G21 to lock.

Hi Wayne and welcome. This model comes with (3) 10rd Magazines. It can accept the larger Gen5 G21 Magazines no issue. If you need even more firepower for home defense, the Kriss kits will add +17rds to the G21 Magazine ( one or three pack here) : https://www.budsgunshop.com/product_info.php/products_id/714024019/kriss+magex2+kit+for+g21+17rd+45acp ------------------------------------------- https://www.budsgunshop.com/product_info.php/products_id/714024020/kriss+magex2+kit+for+g21+17rd+3pk -------------- The finished magazine will look like this : https://www.midwayusa.com/product/1021205516?pid=947280 ------------ Cheers and stay safe!