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Ridge_Runner_5 · January 5, 2013, 01:18 AM

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.

January 5, 2013, 01:18 AM	#2
Ridge_Runner_5 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.