So here's the thing: 1) lowers are forged, not cast. Regardless I wouldn't touch a cast AR lower if it was the last on earth. 2) If you're casting aluminum around glass it doesn't matter what the melting temp is, the glass is going to crack or expand, especially with small details like FCG and selector holes. 3) Most glasses are extremely inert when they encounter NaOH even in extreme concentrations (as an aqueous solution.) As mack7.62 pointed out above molten NaOH will react with glass, but also consider the melting point of NaOH is north of 600 degrees Fahrenheit, well into the range Aluminum begins to become pliable. It won't work. Don't let the good idea fairy bite too hard next time.
In heavenly love abiding, no change my heart shall fear;
and safe is such confiding, for nothing changes here:
the storm may roar without me, my heart may low be laid;
but God is round about me, and can I be dismayed?
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