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Old November 10, 2012, 09:12 PM   #2
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Join Date: June 15, 2008
Location: Georgia
Posts: 8,542

This is about as good a guess as you'll get without a chronograph. They show about 1600 fps from a 20" gun, but individual guns can vary quite a bit. A barrel much longer than 18-20" will gain a small amount, but not as much as you'd see between handgun lengths and carbine lengths.
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