After tens of thousands of rounds through a variety of pistols I have seen a factory plastic guide rod fail exactly once: A USAF Combat Arms instructor who had never handled a Glock before wanted to shoot mine, and afterwards wanted to learn how to field strip and reassemble it. After I showed him how to do that he then did it himself. Upon reassembly as he racked the slide I noticed something fly out the front of the pistol. He had installed the captive guide rod and spring backwards.
So do not install the guide rod backwards and you will be good to go.
So do not install the guide rod backwards and you will be good to go.