The Proof Research .260 Remington carbon fiber pre-fit barrel for the Sig Sauer Cross (brand part number 138946) is an 18-inch, 5-groove barrel engineered for a true drop-in swap with no gunsmith required. It is wrapped from aerospace-grade carbon fiber over a 416R stainless steel liner, cutting weight by as much as 64 percent versus a comparable steel barrel. The extra two inches over the shorter Sig Cross pre-fit option adds a bit more velocity to .260 Rem loads, a worthwhile trade for hunters and long-range shooters stretching distance without a major weight penalty thanks to the carbon-fiber build.

Key Specifications

• Chambered in .260 Remington, a 6.5mm hunting and long-range caliber known for flat trajectory and mild recoil.
• Barrel length measures 18 inches, adding velocity over the shorter 16-inch Sig Cross pre-fit option.
• Rate of twist is 1:8 across a 5-groove bore, matched to standard .260 Rem bullet weights.
• Muzzle is threaded 5/8-24 tpi, ready for a muzzle brake or suppressor without additional gunsmithing.
• Drop-in design is headspace-guaranteed at home, requiring no gunsmith for installation on the Sig Cross.
• Construction pairs a 416R stainless steel liner with a carbon-fiber wrap for faster heat dissipation.
• Weight savings run up to 64 percent lighter than a comparable steel barrel of the same contour and length.

Frequently Asked Questions

Do I need a gunsmith to swap this barrel onto my Sig Cross? No. The Sig Cross’s factory quick-change barrel system plus this barrel’s drop-in design means it is built to headspace and install at home without a gunsmith.

Why choose 18 inches over the 16-inch option? The extra two inches gives .260 Remington loads a bit more velocity, useful for shooters stretching distance at long range.

Does this barrel come threaded? Yes, it ships threaded 5/8-24 tpi and ready for a muzzle brake or suppressor.

Buy the Proof Research .260 Rem Sig Cross 18in Barrel

Order this Proof Research .260 Remington carbon fiber pre-fit barrel for the Sig Sauer Cross from a Lubbock, Texas gun shop. See more calibers and contours in our rifle barrels selection.