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91521 has night sights while 91524 has regular sights, otherwise they are identical. Both are also the discontinued model with the old style magazine release that was an ambidextrous button. 91532 is the newer model where the button is only on one side but can be swapped to either side. From CZ's site about the model distinction: "***Notice*** Due to a delay in production of factory night sights for the P-10 in 2017, several shipments of FDE P-10 Cs were been brought in with standard three-dot sights. These guns are listed under a different SKU (91524/01524) and are priced at the same level as a standard black P-10 C, with an MSRP of $499. Apologies for any confusion this might cause." Link: https://cz-usa.com/product/cz-p-10-c-fde-discontinued-2018/

John, the only difference is the Sights - 91524 has Standard 3 Dot Sights and 91521 has Metal Three Dot Night Sights.

John, Firearms are the same except night sights on model ending in 21 and regular 3-dot sights on model ending in 24. Both set of sights are metal.