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William, the COLT LE 6290 models come with the 4150 Chrome Moly Vanadium Steel barrel iirc. For all intents and purposes for the average user, 4140 is not a bad buy if you go that route. Hope that helps!

William, The heart of this carbine is its 16.1" 4140 chrome-lined barrel. With a 1:7" twist, ammunition selection is virtually unlimited. The "Chrome Lining" will give this barrel plenty of usable life up to around 40,000 rounds.