This CMMG built has a fluted .223 Wylde barrel that offers improved accuracy from a 5.56/.223 barrels and still allows the shooter to use both calibers in the same barrel. This build has a free float key-mod rail and a picatiny rail that runs the length of the upper. This gives the shooter many options for placement of attachments. This is great way to get behind a solid AR built, without spending more than necessary.