Faxon Duty Series 9mm Black Nitride Drop-In Barrel, Fits M&P Shield 3.1in

The Faxon Firearms Duty Series drop-in barrel is a direct-replacement barrel intended for use with M&P Shield 3.1 pistols. Chambered in 9mm Luger and finished in black nitride on steel, this barrel is specified with a 1:10 rate of twist. It is designed for straightforward installation as a drop-in replacement and is identified as the Duty Series model.

Key Specifications

• Chambering is 9mm Luger for common defensive and range ammunition availability.
• The barrel is specified for pistols with a 3.1 inch barrel length (fits M&P Shield 3.1).
• The finish/material is listed as black nitride steel for surface hardness and corrosion resistance.
• The listed rate of twist is 1:10 to stabilize typical 9mm projectiles.
• The model is the Duty Series from Faxon Firearms.
• The barrel type is a drop-in design for direct replacement installation.
• Compatibility is stated as fits M&P Shield 3.1 pistols.

This Duty Series barrel offers a straightforward upgrade path for Shield 3.1 owners seeking a factory-style replacement with a durable nitride finish and a standard 1:10 twist. Its drop-in design makes installation simple while maintaining the intended form and function of the platform, suitable for everyday carry, duty use, and range work.