A LGS has a few polymer 80% lowers (by EPA) for $30 each. I was shocked when I saw the price tag on the lower but had second thoughts when I saw it was polymer. Talked to a chemical engineer friend of mine, he said he didn't know anything about polymer lowers on an AR, but that generally he would be wary of trusting his life to plastic lower. Has anyone had issues with the EPA variant? Specifically concerned about longevity and cracking as time goes on.
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