Stern Defense 00640Swbrl161Inchd1 40 S&W 16.10" Blk Melonite 4150 Chrome

The Stern Defense 40 S&W 16.10" replacement barrel gives your AR-platform build or pistol-caliber carbine a fresh lease on life—or lets you convert an existing platform to run the softer-shooting .40 S&W round. Built from 4150 chrome-moly steel and finished in black Melonite, this barrel combines durability with low maintenance, resisting corrosion and wear even under regular use at the range or in the field. At 16.10 inches, it strikes a practical balance between velocity, handling, and sight radius for both tactical work and hunting applications.

Stern Defense barrels are engineered for reliability in demanding conditions. The Melonite finish is a case-hardening process that creates a tough, corrosion-resistant surface while keeping the core steel flexible—meaning your barrel can handle thousands of rounds without becoming brittle. The 4150 chrome-moly specification is the same material standard used in many factory and match-grade barrels, so you're not compromising on material quality when you swap in a Stern Defense component.

Whether you're building a dedicated .40 S&W pistol-caliber carbine, upgrading an existing AR, or experimenting with a different caliber for reduced recoil and cost-per-round, this barrel is a straightforward drop-in solution. Installation and headspacing should be verified by a qualified gunsmith or performed by someone experienced with barrel fitting—this is not a "just bolt it on" affair.

Key Features

• .40 S&W caliber—lower recoil and softer shooting than 9mm on many platforms
• 16.10" length—manageable carbine-length barrel for handling and practical velocity
• 4150 chrome-moly steel—proven material for durability and longevity
• Black Melonite finish—tough case-hardening resists corrosion and wear
• Designed for AR and pistol-caliber carbine builds

Specifications

Frequently Asked Questions

What guns does this barrel fit?

This is a .40 S&W barrel designed for AR-platform and pistol-caliber carbine builds. Proper fitting and headspacing by a qualified gunsmith is required—do not assume it will drop into any given platform without verification.

Why choose .40 S&W over 9mm?

The .40 S&W delivers a heavier bullet and larger diameter than 9mm, with notably softer recoil than 5.56 NATO. It's popular for shooters seeking a middle-ground cartridge in pistol-caliber builds, and ammunition costs less per round than many larger rifle calibers.

Will this barrel work in my pistol?

This is a rifle-length barrel (16.10") intended for carbine and AR-platform builds, not handguns. Confirm your specific build platform and have a qualified gunsmith verify compatibility.

What does the Melonite finish do?

Melonite is a case-hardening process that creates a corrosion-resistant, wear-resistant surface layer while maintaining a tough, flexible core. It reduces maintenance needs and helps the barrel resist rust and pitting over its service life.