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Forgive my ignorance...what is a "Shilen/Bentz" chamber?

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I was reading about Shilen barrels and they say

"Chamber: Shilen/Bentz, designed for optimum accuracy in semi-autos"

OK, so what does that mean? I was under the impression that aftermarket 10/22 barrels were pretty universal, in the sense that you could buy one and mount it without much fuss.