AR9 4.5" 9mm 9×19 1:10 1/2×28 Barrel 416 Stainless Steel Black

Upgrade your AR-9 or compatible pistol-caliber carbine with the AR9 4.5″ 9mm barrel from Miami Shooters Supply. This precision-crafted Glock barrel is designed for builders seeking a compact, reliable barrel for a tight-quarters build or a dedicated 9mm upper. Machined from 416 stainless steel and finished in a durable black coating, it delivers the accuracy and longevity you demand without the premium price tag. We ship fast so you can get your project on range day.

Key Features

• Precision machined from 416 stainless steel for consistent performance and corrosion resistance.
• Features a 1:10 inch twist rate, optimized for stabilizing a wide range of 9mm bullet weights.
• Durable black finish protects the barrel and reduces visual signature.
• Threaded 1/2×28 muzzle allows for direct attachment of common 9mm compensators, flash hiders, or suppressors (with proper adapter).
• 4.5-inch length is ideal for building compact, maneuverable pistol-caliber carbines (PCCs) or AR-9 pistols.

Built For

This barrel is the core component for anyone building a compact AR-9 platform for home defense, competition, or recreational shooting. It’s perfect for the DIY builder who values a straightforward, high-quality part that drops right into their compatible upper receiver.

Specifications

• Caliber: 9mm Luger (9×19)
• Material: 416 Stainless Steel with Black Finish
• Length: 4.5 Inches
• Twist Rate: 1:10
• Muzzle Thread: 1/2×28
• Compatibility: Designed for AR-9 platforms accepting Glock-style magazines (confirm your upper’s compatibility).

FAQ

Is this barrel compatible with my Glock pistol?
No, this is not a pistol barrel. It is designed for AR-9 style rifle or pistol builds that use a Glock-pattern lower receiver or magazine well.

What type of muzzle device can I install?
The 1/2×28 threading is standard for many 9mm compensators and flash hiders. For 9mm suppressors, you will typically need a fixed barrel spacer or a piston system designed for fixed barrels; always consult your suppressor manufacturer.