16" and 18" are just fine, imo. I had a friend who built an AR on a 16" barrel and took it a sniper competition with me. He was making successful hits at 500 yards.
Any farther than that then I would recommend a heavier caliber.
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Professionals talk about tactics and concepts while amateurs talk about gear and equipment.
Last edited by BlackKnight; 11-06-2014 at 11:37 AM.
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