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Hi Mike and welcome. This is for double stack magazines but there is a single stack insert - https://www.budsgunshop.com/product_info.php/products_id/48525/mla+lula+1911a1+alinr+insrt ----- Cheers and stay safe!

Hi Mike, yes sir, this works on both single and double stack magazines. I use mine on single stack magazines. Stay safe & have a great day!