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If you can, make sure it has the 5R 1:8 barrel. The 1:9 barrel ________ (insert your favorite word).
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I have two AR's - one is 1:9 and one is 1:8. I've been shooting over 50 years. I can't tell any difference between the two. The one I have noticed is the 1:9 is more accurate but I'd bet a dollar that isn't affected by the spin rate. There certainly is a difference in the way barrels are treated but the spin rate is a bit overblown IMO. I haven't shot hundreds of each or anything. I have shot more than a few.