The Proof Research 138960 is a precision drop-in bolt action barrel chambered in .260 Remington—a cartridge that's earned a loyal following among long-range hunters and competition shooters who value its inherent accuracy and ballistic efficiency. This stainless steel barrel comes in a 20-inch length with a 1:8 twist rate and 5-groove rifling, threading to a standard 5/8"-24 tpi specification. Built as a direct replacement for the Sig Cross platform, it's the kind of upgrade that lets you move between different calibers on the same receiver without the gunsmithing bills—just swap, headspace, and shoot.

Proof Research has built a reputation on barrels that shoot. Their manufacturing process prioritizes concentricity and bore quality, which matters when you're trying to stretch shots past 600 yards. The .260 Remington is inherently efficient in that role—it'll deliver quality ballistics in a relatively compact package, and the 1:8 twist is the right match for heavier match-grade bullets that suit long-range work. Whether you're building a precision rifle for the range, assembling a second caliber option for your Sig Cross, or just wanting the insurance of a field-tested spare, this barrel is a straight-forward, no-compromises choice.

Drop-in installation means you're not sending anything out for headspacing or fitting. Proof backs their barrels because they trust their concentricity. Stainless steel resists corrosion and simplifies field cleaning in wet conditions—a practical choice if you hunt in weather or spend time in salt-air environments. If you already run a Sig Cross and want to explore what the .260 can do without the fuss of a gunsmith appointment, or if you're assembling a precision rifle that demands match-grade accuracy, this barrel is ready to work.

The Proof Research 138960 is a precision drop-in bolt action barrel chambered in .260 Remington—a cartridge that's earned a loyal following among long-range hunters and competition shooters who value its inherent accuracy and ballistic efficiency. This stainless steel barrel comes in a 20-inch length with a 1:8 twist rate and 5-groove rifling, threading to a standard 5/8"-24 tpi specification. Built as a direct replacement for the Sig Cross platform, it's the kind of upgrade that lets you move between different calibers on the same receiver without the gunsmithing bills—just swap, headspace, and shoot.

Proof Research has built a reputation on barrels that shoot. Their manufacturing process prioritizes concentricity and bore quality, which matters when you're trying to stretch shots past 600 yards. The .260 Remington is inherently efficient in that role—it'll deliver quality ballistics in a relatively compact package, and the 1:8 twist is the right match for heavier match-grade bullets that suit long-range work. Whether you're building a precision rifle for the range, assembling a second caliber option for your Sig Cross, or just wanting the insurance of a field-tested spare, this barrel is a straight-forward, no-compromises choice.

Drop-in installation means you're not sending anything out for headspacing or fitting. Proof backs their barrels because they trust their concentricity. Stainless steel resists corrosion and simplifies field cleaning in wet conditions—a practical choice if you hunt in weather or spend time in salt-air environments. If you already run a Sig Cross and want to explore what the .260 can do without the fuss of a gunsmith appointment, or if you're assembling a precision rifle that demands match-grade accuracy, this barrel is ready to work.