Not all chrome-lined barrels are stamped externally. The easiest way to tell is to take off the flash hider and check the muzzle - you will normally see a dull gray ring around the muzzle of the bore on chrome-lined barrels. You can also check from the chamber end (look for a dull gray ring around the chamber after you clean it); but there are a small amount of Colts with a chromed chamber and unlined bore out there.
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