BSF Barrels SF3 6mm Remington / .243 Winchester 18" 1:7.5 Bolt-Action Rifle Barrel

The BSF Barrels SF3 is an aftermarket bolt-action rifle barrel built around a stainless steel bore and chamber jacketed in a high-modulus carbon fiber sleeve. The carbon fiber wrap trims overall weight compared to an all-steel barrel of the same contour while keeping the barrel straight and adding rigidity along the bore.

Chambered in BSF's hybrid 6mm/.243, the SF3 is engineered to safely fire both 6mm Remington and .243 Winchester ammunition from a single chamber, letting builders cover the lighter varmint end of the spectrum as readily as standard .243 hunting loads. The 18" barrel is paired with a 1:7.5 twist rate suited to stabilizing a wide range of 6mm and .243 bullet weights.

Designed as an aftermarket replacement barrel for custom bolt-action rifle builds, the SF3 gives gunsmiths and home builders a premium component for upgrading or re-barreling an existing action. The carbon-fiber-wrapped stainless steel construction produces a lighter, well-balanced profile suited to both field carry and bench work.