AAC originally used 1:8 twist on the factory barrels. Later they went to 1:7 twist.
1:8 is fine for 220 bullets or liter. 1:7 is best for heavier bullets or shorter barrels than 16”. I prefer 1:7 so I never have to worry about stability.
AAC originally used 1:8 twist on the factory barrels. Later they went to 1:7 twist.
1:8 is fine for 220 bullets or liter. 1:7 is best for heavier bullets or shorter barrels than 16”. I prefer 1:7 so I never have to worry about stability.