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I use the mecgar in mine and have had great luck with that mag looking up the link now

these have the Flat steel base plate https://www.budsgunshop.com/catalog/product_info.php/products_id/711009552/mec-gar+mgcg4507+1911+magazine+7rd+45acp+blued and these are like the ones that com in the gun with a bumper on the bottom https://www.budsgunshop.com/catalog/product_info.php/products_id/48113

I've used these for years. they work in any 1911 I've tried them in and the springs have 7 years (i use them to practice for competition) on them and they still feed. https://www.budsgunshop.com/catalog/product_info.php/products_id/27450/springfield+pi45523+1911+magazine+7rd+45acp+blued+steel