Thread: ar-15 barrels.
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Old January 17, 2010, 03:07 PM   #10
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Join Date: February 8, 2008
Location: Denver, CO
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The exhaust gasses spend more time pushing the round, so it goes farther, more accurately.

It also spends more time traveling back to the bolt to cycle it, which makes the round more accurate by giving it more time to leave the barrel before the weapon starts jerking around from cycling the bolt.
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