Question about long term durability
We all know that for high round counts the polymer pistols are better for reliability and durability than the metal frame models. But after talking to my neighbor who is a doctor I am wondering about time taking a toll on the polymer causing it to go brittle, i.e. 20 or 30 years down the road. He said the medical field switched back from polymer to stainless on joints, one of the reasons being the polymer degraded. I know that it is a completely different polymer for frames and artificial joints but I am wondering anyway.
I think we should be able to get some insight now since various rifles have had polymer stocks since the 60s, the AUG has been out since 1977 and the Glock has been around since 82. Has there been any problem with these platforms as far as plastic degredation?