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Buy the Glock put on whatever night sight you like and move on.

Unless you are trying to melt down a Glock your guide rid should be just fine.

I used to change every Glock to a Tungsten guide rod. I never seen any difference other it made my wallet lighter.

I believe that is the Tungsten or Stainless was better Glock would have used them. It appears the plastic works for decades.