The Proof Research .308 Winchester carbon fiber pre-fit barrel for the Sig Sauer Cross (brand part number 134481) is a 20-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 Sig Cross’s factory quick-change barrel system means this pre-fit is designed to headspace at home, letting an owner add a lighter, stiffer .308 Win barrel to their Cross in an afternoon rather than sending the rifle out.

Key Specifications

• Chambered in .308 Winchester, one of the most widely available and versatile bolt-action calibers.
• Barrel length measures 20 inches, a balanced length for a compact, quick-handling .308 Win build.
• Rate of twist is 1:10 across a 5-groove bore, matched to standard and heavier .308 Win 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.

How much lighter is this than the factory Sig Cross barrel? The carbon-fiber wrap can cut weight by up to 64 percent versus a comparable steel barrel of the same length and contour.

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 .308 Win Sig Cross Barrel

Order this Proof Research .308 Winchester carbon fiber pre-fit barrel for the Sig Sauer Cross from a Lubbock, Texas gun shop. Browse more gunsmithing barrels and parts in our rifle barrels.