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Headspacing is in the barrel extension. Lapping / shimming should not affect headspacing. It does change the location of the lock lugs by a few thous. Between the bolt and bolt carrier there is about 1/4" margin built in the design to delay the locking / unlocking. A few thous change shouldn't be problem. Lapping / shimming is perpendicular to the pin slot. It doesn't change that either.
I prefer shimming (actually not quite shimming in normal sense) to lapping for a few reasons. I generally don't want to remove metal from parts if I don't have to. Shimming is reversible. Spending money to buy another tool is another reason.
There was a bit of residue on the barrel shank. When I wriggle the barrel I could feel a slight slop there. The loctite hopefully will fill that.
Will shoot some group to see how it works.
-TL
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