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John, the sights are removable and replaceable with Night Sights if you desire.

John, The rear sight is dovetailed in and front sight is on a post fastened by nut under slide. Both can be replaced. Lots of night sights for Glocks. Here's some:----- https://www.budsgunshop.com/catalog/product_info.php/products_id/2133/ameriglo+gl446+spartan+operator+night+sight+glock+17%2f19%2f22%2f23%2f24%2f26%2f27%2f33%2f34%2f35----------https://www.budsgunshop.com/catalog/product_info.php/products_id/104514/hiviz+gln325+litewave+h3+fits+glock+9%2f40%2f357+%28not+42%2f43%29+tritium%2ffiber+optic+green+tritium%2ffiber+optic+green+black or just look here under sights----------https://www.budsgunshop.com/catalog/search.php/type/Optics++Sights