The one-piece construction of the Talley Lightweight Alloy Scope Mount is unique. The rigid design has no joint between the scope and the rifle. The Talley Lightweight unitized design eliminates the possibility of an out of alignment interface or loose connection between the ring and base of traditional two-piece designs. Ultimately this provides more strength and durability than rival steel rings and bases but doing it with a lighter overall weight. The Talley Winchester 1 inch Model 70 (.860) mount is for standard caliber and short mag (Low).