Never get lost again! Conceived by SFC. Doyle and designed by Troy Industries founder Steve Troy. The first stock of it"s kind to come equipped with a personal Garmin Fore Trex 401 GPS device directly embedded into the stock for easy viewing while patrolling. For Mil-Spec receiver extensions tube only.Patent PendingMade in the U.S.A. *Lifetime limited warranty (stock only), see www.troyind.com for details.The embedded Foretrex 401 combines a high-sensitivity waterproof GPS receiver, electronic compass and barometric altimeter into a lightweight device. To share data easily, you can connect Foretrex to your computer with USB or just send data wirelessly to another device. Foretrex keeps track of your path and displays it as a dotted trail on the screen. Just turn on Foretrex"s TracBack feature, and you can retrace your path back to where you started. Keep track of your bearing and altitude with Foretrex 401"s electronic compass and barometric altimeter.- Black