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Old April 21, 2009, 07:08 PM   #2
Dfariswheel
Senior Member
 
Join Date: May 4, 2001
Posts: 7,477
The detent is to both give the elevation screw it's "click" AND to make sure the sight retains it's setting.

No detent, and the sight screw may move, causing the sight to drift off target.
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