Winchester Model 70 Sporter Boss .300 Win. Mag., it comes with a Leupold Mark 3HD 4-12 optic, EGW 20MOA rail. Other than a couple of small scuffs on the Stock this Model 70 is in excellent condition. This has the BOSS Muzzle Attachment. Ballistic Optimizing Shooting System. This allows the shooter to tune barrel harmonics. By turning the calibrated ring, you can change how the barrel vibrates when fired to match the specific ammunition, drastically tightening group size. This ported style will significantly reduce felt recoil.