You said the word Glock. That means from that point on all logic left the discussion, the cult will be coming out in defense of thier religion, all logic will be tossed aside. After all, blasphemy deserves no logical debate.
Couldn't you at least lie and say it was some other polymer gun made from the same thing so we could have some logic in the discussion?
I like some Glocks myself, but I swear...
Glock frames are made from Nylon 6, with some variation.
The melting point is very different than the softening point. The melting point is when the material turns practicly into a liquid, it can can be melted and shaped, but it can also be softened and merely distorted.
Glass transition temperature of nylon 6 is around 50C, with slight variation in different studies of the material changing from the upper 40's to lower 50's.
Take this link for example:
http://www.polymerprocessing.com/polymers/PA6.html listing
Glass Transitioning Temperature at 47C or 116.6F! It lists the
melting point at 220C or 428F.
So a very big difference between glass transitioning temperature range and melting temperature.
More proof that it is changing at such temperatures is even hinted at in the GlockFAQ at
http://www.glockfaq.com/generalinfo.htm :
"Chemically stable in a majority of environments, attacked directly by strong acids and bases (better than steel actually). UV exposure results in degradation over an extended period of time. 2-3% carbon black virtually eliminates UV degradation and Carbon-Black does not become readily absorbed in Nylons offering higly increased useful life spans. Loss of mechanical properties with 2% Carbon-Black is less than 0.05% on an elevated UV exposure test equivalent to approximately 100 years.
Hyrdolytically attacked by water in excess of 120 degrees. Basically, no hot-tubbing with your Glock and you will be fine."
Now being attacked by water at ~120 degrees is a different point, but it is obvious changes are going on in the structure if that becomes possible then and not at lower temperatures. Funny how that temperature about coincides with the glass transitioning temperature isn't it?
There is many other sources for properties on Nylon 6. If you are too stubborn to take my word for it, the terms to look for are "glass transitioning".
You can research what that means, how it works, and what it means for a material.