well i dont know about you guys but i couldnt see the white sights for sh*t when it was sunny out and i was wearing glasses instead of contacts i could barely see the stock sights i got a good deal on a black sight and i never looked back spend the extra money if your planning on keeping your ps-90 for life like me its worth it if you love your gun and want to keep it if it is just a toy for the year or so then the choice would be up to you