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Outer barrel or inner barrel?
The outer barrel of a standard M4 is 14.5 inches. A standard RIS on that would generally be about 8 inches or so.
Now, going by that (if yours is in fact a standard RIS) the Colt Commando barrel (Model 733) is 11 inches. You'd have about 3 inches sticking out.
Your post wasn't exactly clear, so this is what I think you were asking.
Last edited by Firewalker; June 7th, 2008 at 03:16..
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