Glock 20 FTF issues
So I sold a glock 20 recently and upon meeting with the seller the pistol was difficult to take apart. The guiderod and spring appeared to be slipping off the perch and catching when the slide is retracted. The buyer didn't seem too concerned, but today sent me a message saying he's having lots of FTF issues with the pistol.
Any ideas as to possible reasons for this? Why would the guidrod all of a sudden start slipping off the perch?
The pistol has both the stock guiderod assembly and an extra power steel spring as well. It also has the NY trigger mod that makes the trigger somewhat heavier, but more crisp. I don't know why either of these mods would all of a sudden cause FTF issues.