.300 BLK

300 Blackout Combat Series Barrels

Chrome-lined 300 BLK barrels for hard use. Built from 4150 CMV steel with a chrome-lined bore & chamber and a rugged mag-phos exterior for maximum service life.

4150 CMV Steel Chrome-Lined Bore + Chamber Mag-Phos Exterior 100% Wet MPI Inspected
Find the Best 300 BLK Barrel for Your Build → Compare lengths, gas systems, and use cases.

Why Choose a 300 Blackout Combat Series Barrel?

Faxon’s 300 Blackout Combat Series barrels are engineered for shooters who expect their rifles to endure sustained heat, higher round counts, and real-world handling. These barrels are built from 4150 CMV steel and feature a chrome-lined bore and chamber—an ideal combination for durability, erosion resistance, and long service life in hard-use 300 BLK builds.

If your setup is a defensive carbine, training gun, or “run it hot” range rifle, Combat Series is purpose-built for longevity. For shoppers comparing barrel lengths, gas systems, and suppressed vs. unsuppressed use cases, our 300 Blackout Barrel Guide breaks down the best options for your build goals.

Combat Series Construction & Quality Control

  • 4150 CMV Steel: Military-spec chrome-moly-vanadium steel selected for heat tolerance and structural strength.
  • Chrome-Lined Bore & Chamber: Extends service life and resists throat erosion under sustained firing.
  • Manganese Phosphate Exterior: Rugged mag-phos finish for corrosion resistance and duty handling.
  • Traditional Button Rifling: Proven cold-form rifling paired with in-house stress relief for long-term stability.
  • 11-Degree Target Crown: Clean, repeatable bullet exit for dependable consistency.
  • 100% Wet MPI Inspected: Every barrel is magnetic particle inspected before final QC.

Every Faxon rifle barrel begins its life in our Greater Cincinnati manufacturing facility, where we control critical steps of production from raw steel through finishing and inspection. Combat Series barrels are proudly machined start-to-finish by Faxon Firearms in Ohio—giving us direct oversight of materials, processes, and quality at every stage.

Choosing the Right 300 Blackout Setup

300 Blackout performance depends heavily on barrel length, gas system, and ammunition selection. Combat Series barrels are built to prioritize durability and reliability, especially in high-volume use. If you’re optimizing for suppressed shooting, subsonic reliability, or the best “do-it-all” configuration for your platform, reference our 300 Blackout Barrel Guide for a clear, build-focused breakdown.