I have had a lot of the plastic guide rods break. All of them had over 15000 rounds on them and had been through multiple spring changes. I have wondered if the reason for the breakage is caused by the abuse the rod takes when swapping out the flat spring?
doesn't Glock recommend changing out the recoil spring/guide rod assy something like every 5k-10k rounds or so? These things are dirt cheap. I can understand the attraction of going with an aftermarket assy if you're trying to respring the gun due to ammo or other customizing "tweaks" of the striker spring, but if you're trying to save money by replacing only the spring, please tell me that when you get the oil changed on your vehicles, you also change the oil filter too.