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I couldn’t understand the aluminum reciever of the AR15, understand how the thin aluminum could hold the bolt in tolerance nor take the recoil until; I saw one apart and saw the barrel extension.

It’s the barrel extension that makes the lock-up of the bolt; I guess the extension is actually the ‘receiver’ per-se.

But then, I saw the different uppers, like .338lapua, 50bmg, and other esoterica, and I couldnt understand, until, I realized the lower, which is the AR receiver, is really just the trigger group. (magazine well if needed)

Seeing the extension, bolt & barrel all 3 pieces in your hand made me realize how cute these things really are, but then, they are not blued steel and bright walnut. they are cute, but they are not ‘pretty’

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