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The 1/7 is to give a little more stability to 220+ grain bullets.
I did a 30 round group with 1/7 and 1/8 with Remington 125 grain ammo, and there was no difference in accuracy.
The rifle has the 17 Fireball bolt guts.
If you have a Micro-7 with feeding problems, AAC would like to get you an RMA number and repair it. The problem was some of them had a double (223-like) feed ramp rather than the one large scoop 308-style feed ramp. It makes a big difference.
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R&D for AAC
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