BSF Barrels SF3IYT2278 AR-15 .338 ARC 12" 1:8 Twist Barrel

The BSF Barrels SF3IYT2278 is a precision 12" replacement barrel chambered in .338 ARC, purpose-built for the AR-15 semi-automatic platform. Manufactured in the USA, it showcases BSF's signature carbon fiber construction: a match-grade 416R stainless steel bore encased in a roll-wrapped carbon fiber sleeve loaded under tension, pairing the accuracy of a stainless barrel with the weight savings of carbon fiber technology.

The 1:8 twist rate stabilizes a broad range of .338 ARC bullet weights, making this compact 12" barrel a strong choice for short AR-15 builds in the .338 ARC chambering. The carbon fiber wrap is drilled to vent heat, preventing delamination and keeping the barrel running reliably during extended use.

Whether you are building a new AR-15 in .338 ARC or replacing a worn barrel on an existing platform, the SF3IYT2278 delivers match-grade accuracy in a lightweight, purpose-built package.