Straight fluting is cheaper, but the odds of the flutes indexing right at the 12 o'clock position is not good, but if you can send the reciever with the recoil lug and barrel to the person fluting, they can make sure it lines up. The helical or spiral fluting is what I would prefer for a rifle that uses a barrel nut, because if it doesn't index correctly it doesn't look funny!
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