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Old January 5, 2013, 01:18 AM   #2
Senior Member
Join Date: February 8, 2008
Location: Denver, CO
Posts: 1,925
If it doesn't line up fully, your spent casings will either eject at 1-3 o'clock, or won't eject at all.

Best way is to use a level to get the upper receiver flat, then use another on the gas block to make sure it is, too.
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