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Scalarworks fixed sights.

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That A2 rear sight setup was for major range changes - out to 800 meters on the M16A2 fixed carry handle (incorporated into the upper) and out to 600 meters on the M4 detachable carry handle. The M16A4 detachable carry handle only did 600 meters, because the length of the threading for the 800 drum is too long to use in a detachable handle.  That thing goes down into the receiver body a little.

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