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The Mk4 LE features a nitrided 16.1" 4140 CrMo steel barrel in a M4 barrel profile. The standard configuration includes a "F" marked front sight base and M4 style hand guards.
CMMG Upper 223 Rem 556NATO 16" Black 1:9 WASP Flat Top AR Rifles A2 Front 55BE1F0
WARNING: This product may contain chemicals known to the State of California to cause cancer and birth defects or other reproductive harm. For more information, go to www.P65Warnings.ca.gov