I can only assume that polymer firearm frames are made of much better plastics than the rather flimsy trim pieces found in some cars these days. Since the trim doesn't melt, I wouldn't expect the firearm to either.
Smith, and Wesson, and Me. -H. Callahan
Well waddaya know, one buwwet weft! -E. Fudd
All bad precedents begin as justifiable measures. -J. Caesar