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to provide a fast, secure, and enjoyable experience. by SAWYER, from IN, United States Asked on November 8, 2018
The 5.56mm and the .233cal are identicle in size and shape. The diffrence is the charge or powder used to expel the projectile. This BCG will fire either.
Basically same chambering, difference is .556 handles higher pressures NATO specs generally .223 by popular belief claims to be a more accurate round.
