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Old April 2, 2011, 08:18 PM   #17
James K
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Join Date: March 17, 1999
Posts: 24,383
Is the barrel a GI barrel? If so, there will either be a draw line on the left side of the barrel shoulder or, if the rear sight base is installed, there will be a "shelf" on the sight base itself at 90 degrees off the vertical to the left.

That line or that shelf must line up with the draw line on the bottom of the receiver. If it does, and the barrel is not tight, it is a takeoff barrel and the shoulder can be rolled (as Unclenick says). Headspace might or might not be right, in which case other steps have to be taken depending on the amount and type of headspace (too much or too little).

But it is that draw line that ensures the front sight and extractor cut will be in the right position when the barrel is installed.

Jim
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