From The Manufacturer/Wikipedia/People Smarter Than Us:
The DTI Evolution has a 16″ Mid-Length CMV chrome lined barrel with 1×9 twist and a lightweight profile. This rifle features Samson Evolution 12.37″ Free Float Rail over a Samson Low Profile Gas Block, Samson Front and Rear Folding Sights, to complete the rifle Magpul Moe+ Grip and Magpul CTR Stock. The rifle also comes with a CA approved Gun Lock. Available in Black or Dark Earth.