Not 13 in. - Geissele 13.5in MK14 Super Modular Rail

The handguard is awesome. The Mlok section is silky smooth and skinny and feels real good in the hands. My only gripe is that the handguard is not 13 in. its 13.5 so buy accordingly when you are trying to get a barrel and muzzle break especially if your like me and your trying to install a suppressor on it as well. 14.5 may be a safe barrel length to go for for those that are interested in making the muzzle break and end of the handguard close as possible.