Jaymo said:
Plastic parts in cars still don't hold up.
Kind of depends upon where and how that plastic is used, wouldn't you say?
The comment that prompted my response spoke of a melted poly frame. A fire hot-enough to melt a poly frame is likely to also put a steel gun out of service. I'm pretty sure that the heat needed to weaken a poly-frame isn't much different than the heat needed to melt it -- so I call BS on both the original statement and your claim about weakened frames, too. Perhaps some chemists or technicians participating here are familiar with the materials can address the issue directly.
As for cars -- there's lots of plastic in steering wheels, dashboards, tubing, accessory parts, fluid reservoirs, grills, light enclosures, duct work, door panels, and shields. There's even a thin layer between the glass layers in the windshield to make it shatter proof. Some versions of the composite materials used in aircraft are polymer, and you can bet that type of material will eventually make its way into structural components in cars, when they figure out how to do it cheaply. It's already being used in the frames of the very top-end sports cars. The less costly plastics works well, cost less, reduce weight, and make service easier in many auto applications.
Over the past 20 years or so, I've seen a few guns damaged by fires. In a couple of cases they looked damaged -- but it seemed to be nothing that refinishing wouldn't fix, but gunsmiths examining the guns wouldn't give them "good to go" status. They also wouldn't even use parts from those guns. Such fires seem to be relatively rare. You don't hear about such problems on forums like this -- probably because many owners would be ashamed to admit that they had their guns damaged by fires. (Smaller fireproof safes ARE available and are NOT expensive.)
I've also seen a few guns damaged by over-charged ammo, some of it bought at gun shows from reloaders, and a few damaged using bad factory ammo. The guns in question ranged from steel and alloy to poly frames, and in most cases, the guns were all badly damaged; sometimes the shooters were damaged, too. Steel guns don't seem to protect the shooter any better than poly guns in those cases. Shrapnel is shrapnel and the slides are similar.
I am neither for nor against polymer or "plastic" guns, when they're done right. I own both steel and polymer, enjoy shooting both, and have owned guns in all price ranges. Like you, I don't think people should make poly-framed guns out to be more than they are.
The same should be true of steel-framed guns, too. Just because the materials used to build the frame is steel, it won't make a crappy design a magically great gun.
If we should not make these poly guns out to be MORE than they are, I think we should also avoid making poly-framed gun out to be LESS than they are. Talking about poly guns (or any gun, for that matter) being weakened by fire damage seems to be one such effort -- the equivalent of making a mountain out of an
imaginary molehill.