Ferret50 upper. It has a 36" ChromMoly barrel with Hybrid chamber. It has the Serbu shark brake and original brake. and Bipod included. Had it for 2 years fired less than 100 rounds. Asking $1750. I still have it mounted on a bushmaster lower and a NXS Nightforce 5.5 - 22 x 56mm scope on it. This price does not include; Lower, rings or scope.