Lead & Steel Llc LS9mm4.5-28 AR9 9mm Luger 4.50" Threaded Black Nitride Chrome Moly Vanadium

The Lead & Steel LLC LS9mm4.5-28 AR9 barrel is a purpose-built 9mm Luger replacement barrel for AR-platform pistols and short-barreled rifles. If you're running an AR9 build and want the flexibility to swap to a fresh tube or upgrade your ballistics, this 4.5-inch threaded barrel delivers the compact profile shooters expect from a 9mm AR pistol while maintaining compatibility with your existing platform. The black nitride finish over chrome moly vanadium steel construction means you're getting a durable, corrosion-resistant barrel engineered to handle the pressures of 9mm Luger ammunition.

A threaded muzzle opens up your accessory options—whether you're adding a suppressor for hearing protection and reduced noise, a muzzle brake to manage recoil, or a flash hider for low-light situations. At 4.5 inches, this barrel strikes a balance between velocity and handling; you'll get reasonable bullet speed without sacrificing the compact handling that makes AR9s so appealing for home defense, competition, or fun at the range.

Lead & Steel LLC manufactures barrels built to spec, so you can trust the fit and finish on this component. If you're a builder or an AR9 owner looking for a quality spare or upgrade, this barrel is made from proven materials that shooters rely on.

Key Features

• 4.5-inch length optimized for 9mm AR pistol and SBR builds
• Threaded muzzle for suppressor and muzzle device compatibility
• Black nitride finish for corrosion resistance and durability
• Chrome moly vanadium steel construction for strength and longevity
• AR9 platform compatible

Specifications

Frequently Asked Questions

Will this barrel fit my AR9 build?

This barrel is designed for AR9 platform rifles and pistols. Verify that your lower receiver and bolt carrier group are AR9-compatible before purchasing, as AR9 uppers and lowers differ from standard .223 AR platforms.

Can I use a suppressor with this barrel?

Yes. The threaded muzzle is ready for a suppressor or other threaded muzzle device, provided it is compatible with 9mm Luger and the thread pitch of this barrel.

What ammunition does this barrel fire?

This barrel is chambered in 9mm Luger (also called 9x19mm NATO or 9mm Parabellum). Use only ammunition marked for 9mm Luger; do not use other 9mm variants.

Is this a complete upper or just the barrel?

This is a barrel component only. You will need a compatible AR9 upper receiver, bolt carrier group, and other parts to assemble a complete upper.