I found door frames and other hard, usually vertical surfaces, were hard on the plastic sights.
My first 17 came with the adjustable rear sight, which I promptly broke off while in my holster, when I clipped a door jamb. I was still able to use the "base" as an improvised sight until the replacement came.
Even the fixed plastic rear sights seem to get beat up pretty easy, with normal day to day use.
The factory night sights, which are metal, hold up much better.
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