Quote:
Originally Posted by August
My thought was to buy a complete upper including bolt carrier group (though that is a quick enough swap), front sight post and hand guards and bring one or the other to the range depending on what type of ammo I have.
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Well, if you get a 5.56 NATO chambered upper, its really all you need. Headspace aside (haven't done my homework on .223 and 556 headspacing, I'm assuming their same), you have the chamber pressure rating to feed it 5.56 or .223 at that point. My wife can feed either one through her rifle without any issues whatsoever.
EDIT: I think the only major difference is more brass expansion with .223, the cases are slightly thinner then 5.56, and NATO chambers tend to be a bit looser to allow for dirt, and debris.