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Frank, any Standard 1911 7rd Magazine (Without the Bumper Pad) will fit flush and function. https://www.budsgunshop.com/catalog/search.php?q=1911+magazine&type=

I've found these to be the longest lasting and most reliable. I have some that I use extensively in practice (I'm a professional shooter and do not like to beat up my high dollar, tuned 8 shot mags doing drills) and after 7 years they are still going strong and I haven't even changed the springs. https://www.budsgunshop.com/catalog/product_info.php/products_id/27299/springfield+pi4520+1911+magazine+7rd+45acp+stainless+steel