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Matthew, this barrel is constructed out of Chrome-Moly 4140 steel chrome lined barrel - standard military. Cheers and stay safe! ---- https://charliescustomclones.com/colt-le6920-16-barrel-assembly-with-fsb/

This has a parkerized Chrome-Moly 4140 steel barrel, and is chrome lined. Hope this helps.

The CR6920 has a standard M4 profile, made of CMV 4140 Steel, and is a chrome-lined barrel. The markings on it are "13629 MP 5.56 NATO 1/7". The barrel extension has a 'o' on the left side and a '4' on the right side which indicates it is a Colt barrel extension. There is an 'R' stamped on the outside of the barrel indicating it is made by Rosco. There is not a barrel date present on this carbine. The carbine has a standard A2 flash hider.