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The Pearce 26 will fit the Glock 26 mags. It is a grip extension only and does not increase capacity of the magazine.

Stephen, this is a "Grip Extension" for the Gen3 Glock 26/27/33/39 Magazine and it adds +1 Rounds : https://www.budsgunshop.com/catalog/product_info.php/products_id/714004224/pearce+plus-one+ext+glock+27%2f33