The nut just takes up the space difference between the stem lengths on the SA and LA bolt heads, thus allowing you to use SA bolt heads on a LA bolt and receiver.
If you can find a 223-LA head that's the best way, the Extension Nut is the next best option, and then I have heard about people using precision washer to take up the space. Haven't tried the washer option yet myself so I can't speak for it.
There was a couple of LA 223 bolt heads for sale in the classifieds here, first time I've seen any up for grabs in a long time.
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