Temperature effects of polymer framed guns, how much heat?

[His lordship.]

I was wondering the other day on just how much heat from the local environment during summer will a polymer framed gun tolerate before they melt or get soft.  I once left a plastic model airplane in the back window of a closed up Chevy when I was a kid during the summer in Pennsylvania, and after a few hours it was sagging.

Places like Arizona and Texas can get hot, what if you left your Glock or Springfield XD-9 on the dashboard in a closed car in the hot sun, or in the trunk, would it get damaged?  I figured that this would be a good police or hunter question.

Thanks.

[Lloyd Smale]

glocks and sigs are used in desert countrys and ive never heard of heat hurting a single one of them so i doubt if your going to hurt on in the US unless you put it in an oven.

[Castaway]

Your biggest concern is if the ammunition is also hot.  Pressures will increase greatly.