The GEMTECH Tracker was designed for military snipers and has been adapted to suit the U.S. hunter market. *Note- 139dB S&W M&P Sport .223 16″, 128dB Daniel Defense DDM4V11 300BLK 16″, 136dB Remington 700 7mm Rem Mag 24″, 138dB Savage Model 10 .243 WIN 18″ and 138dB Weatherby Vanguard 300WM 24″.