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Old June 1, 2013, 09:43 AM   #7
BillM
Senior Member
 
Join Date: January 20, 2009
Location: Amity Oregon
Posts: 373
I melt plastic for a living---primarily extrusion. I've messed with
the pieces left over after a G17 grip frame reduction, and they
appear to be a nylon of some sort.

Typical castable nylon properties:

Continuous use temperature 200°F +

Softening temperature 300°F +

Melt temperature 400°F +

So----Nope, the heat in a truck won't hurt it. If it is in direct
sunlight it would probably affect it after long exposure, most polymers
eventually show some signs of UV degradation.
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