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Old April 20, 2008, 07:53 AM   #3
Junior Member
Join Date: December 8, 2007
Location: On the Wild Side
Posts: 2
I have both YHM 9584 and 9680 BUIS. The 9584 is mounted on a YHM 9380 gas block and they work fine. I have never had a problem with them. For the money they are hard to beat
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