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I'm building my first AR, and I was just wondering what makes one BCG better than another. If they are both the correct tolerances to fit within a milspec upper, is their really an advantage to having one over the other?
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It's more than just tolerances. It's also the materials used in the construction and the testing procedures. Inferior materials make for weaker parts and improper testing procedures can let bad units slip out of the factory more easily.
While currently out of stock, I would recommend
one of these.