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Old March 21, 2009, 03:42 PM   #3
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Join Date: May 27, 2007
Posts: 5,040
The locking bar sight was used in WWII. Springfield Armory was later able to design an elevation knob that did not work loose under recoil.

The older sights, most of them were replaced in when the rifles were rebuilt. But then, some leaked through.
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