The relatively huge flat area behind the recoil lug is designed that way to provide all the bedding surface needed. The tiny flat on the bottom of the lug will cause problems when crap gets into the bottom of the lug recess and holds the receiver off the stock.
Leaving the sides of the lug tight to the bedding just makes it hard to remove and does nothing to keep the receiver from moving side to side. Again, the huge flat the length of the receiver is many times larger than needed for alignment.
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