Nothing really wrong with the plastic guide, millions of rounds have been fired through countless Glocks using them and they rarely break. For that reason I haven't researched aftermarket RSAs. Sorry, I don't know which weight spring GM uses.
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The biggest issue with assembling an AR isn't so much getting the parts together right - it's getting the right parts together.
You'll remember the quality of a gun long after you forget how much you paid for it.
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US Army 1966-69, VFW Life Member, Retired Geek
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