Daniel Defense CHF Chrome-line and Ionbonded exterior (DLC) Chrome Moly barrels are some of the most consistently produced 18" barrels that can be thrown in the mud and picked up and keep working. There is a lot to be said about chrome lining for durability.
The Daniel Defense 18” MK12 barrel, chambered in 5.56mm NATO, is known for its use by US Special Operations, and the profile that Daniel Defense uses allows for the addition of an Allen Engineering collar and brake. The barrel is constructed from a proprietary Stainless Steel blend with the chamber created during the Cold Hammer Forging process, which ensures the most precise alignment of the chamber to the bore possible. These barrels, some of the most accurate and durable barrels attainable, are DLC finished. The MK12 barrel is engineered with a rifle length direct impingement gas system and is a solid choice for your AR-15 Build.
Note: this barrel will not allow you to install the Allen Engineering Suppressor, but for those shooters looking for the Mk12 look, and want a quality barrel without paying for match quality and super-clone correctness, the Daniel Defense Mk12 barrel is a good solution.