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NM, I answered my own question:
"Barrels intended for long, small-diameter bullets, such as the ultra-low-drag, 80-grain 0.224 inch bullets (5.2 g, 5.56 mm), use twist rates of 1 turn in 8 inches (20 cm) or faster"
Because this gun is, by default, suppose to use 5.56, with an 80gr it should give you your 1:8 twist ! I was calculating it with an average .223 bullet. This makes sense because a 5.56 has ??? higher pressure and is the only difference between a .223... ???
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