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they are a standard GI style sight. To install night sight will involve major gun smithing and will cost more than the gun You would be much better off buying a 1911 with a dovetail sights like this RIA https://www.budsgunshop.com/catalog/product_info.php/products_id/35190/rock_island_51431_rock_standard_fs_single_45_acp_5_8+1_black_rubber_grip_black
if you really want Night sights on the Tisas contact dawson precision (google search) It will not be inexpensive though
Paul, most local FFL's will either have or know of a Gun Smith who would be able to recommend/install Night Sights on this 1911. Most are intimately familiar with the 1911 platform.