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.223 / 5.56 Barrels

AR-15 barrels from US manufacturer SAA in the most popular caliber 5.56.  Barrels from SAA are chambered in the modern ".223 Wylde" chamber.

The .223 Wylde is a chambering between the old original .223 Remington and the military's 5.56x45mm NATO.  The .223 Wylde is a more potentially accurate chambering than the 'looser' 5.56, while also being designed to be capable of safely and accurately chambering and firing both .223 Rem. ammo as well as actual 5.56x45mm ammo, just like a 5.56 chamber.  .223 Wylde is basically an optimized 5.56 chamber as it can safely use both kinds of ammo like a 5.56 chamber can, yet it does a better job at it.