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David, they are identical except for magazine capacity. Upc number 787450596733 has two Magazines, one 12 round magazine and one 15 round magazine. Upc number 787450720848 has two 12 round magazines. They are absolutely identical otherwise. Hope this helps.

David, 787450596733 has Phosphorous White Dot Front Sight with Blacked Out Rear Sight and 787450720848 has Contrast Sights. Cheers and stay safe!