Comment(s)

Part of the AR’s ingenious design lies with two pins: the takedown pin and the pivot pin. Pop out these two pins and the upper receiver can be removed and swapped, allowing a user to instantly change the caliber of an AR, or for specific needs like CQB or long-distance shooting, reduce or increase barrel length, respectively.

For more information on the AR uppers listed in the gallery above, please visit the following websites:

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