This is a Tracker stock that is bedded for a Turbo Rimfire. It came with the gun when I purchased it. It has a 3 inch forearm, but is has a longer forearm than a rimfire benchrest but worked well. I believe it may be a MBR Big Dawg, but that is a guess. It has one spot on the right side and the clear coat is bubbling on both lower sides. $600 plus shipping or best reasonable offer. I have a new ROTEX coming.