Like New Desert Tech MRDX forward eject chambered in 556. 16 in barrel, but shorter than a 10.3! Awesome ballistics in a short package. Grab yourself a barrel and swap calibers in less than 5 mins. Thanks to the design and a removable magazine well block, it will run most of your ar-15 and ar-10 calibers like 6.5 creed or 308. Runs great, sub 200 rounds. Irons not included and will have factory muzzle device. Hard sided factory case included as well.