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William, no Sir. Fits: - Glock G17,19,22,23,31,32,33,34,35,37,38 and 39 pistols.

Unfortunately, no these will not fit the Glock 21. Sorry but hope this helps.

No but several options from meprolight here for the G21. https://www.budsgunshop.com/search.php?q=Meprolight+sights+glock+21&type=