Faxon Firearms Duty Series 5.56 NATO 12.5" 1:7 Twist 4150 CMV Medium Taper AR-15 Barrel - Chrome Mag Phosphate

The Faxon Firearms Duty Series 5.56 NATO barrel is purpose-built for AR-15 platforms that demand dependable performance and long service life. Machined from 4150 CMV steel, button rifled, and finished in Chrome Mag Phosphate, this 12.5" carbine-length barrel delivers the durability and accuracy serious shooters expect from the Duty line.

The barrel features a 1:7" twist rate optimized to stabilize a wide range of 5.56 NATO bullet weights. The bore and chamber are chrome-lined for improved corrosion resistance and extended service life under high round counts, while the Medium Taper profile trims weight without sacrificing barrel rigidity or heat management. A carbine-length gas system keeps the action cycling reliably across a broad spectrum of ammunition and suppressor setups.

Every Duty Series barrel is fully machined, stress relieved, and air gauged in-house at Faxon Firearms in the USA to confirm concentricity and bore uniformity before it ships. This drop-in replacement fits any standard AR-15 upper. Whether you are building a compact defensive carbine, a training rig, or other short-barrel AR-15 build, this barrel delivers the proven Duty Series pedigree in a short, handy package.