For builders looking to complete a compact AR-9 pistol or SBR upper, this AR9 4.5″ 9mm barrel is a critical component. Designed for the popular 9×19 Parabellum cartridge, this short barrel is engineered for reliable blowback operation in dedicated AR-9 platforms. Its 4.5-inch length makes it an ideal choice for creating a highly maneuverable and fun-to-shoot firearm, perfect for close-range training and home defense. Sourced from Miami Shooters Supply, this AR-15 part ships fast so you can get your build on the range without delay.
Key Features
- Machined from solid 416 Stainless Steel for durability and consistent performance.
- Features a 1:10 twist rate, optimized for stabilizing a wide range of 9mm bullet weights.
- Threaded 1/2×36 at the muzzle, providing a standard interface for attaching compensators, flash hiders, or suppressors (with proper adapter).
- Finished in a tough Flat Gray coating that resists wear and provides a clean, modern look.
- Chambered in 9x19mm (9mm Luger) for use with readily available and affordable ammunition.
Built For
This barrel is built for the practical builder assembling a compact AR-9 pistol for dynamic shooting, truck gun duty, or a suppressed host. It’s also an excellent choice for competitors in PCC divisions who want a ultra-short configuration, provided their specific competition rules allow it. You need a properly configured bolt, buffer system, and magazine block or dedicated lower to run this barrel reliably.
Specifications
- Caliber: 9x19mm (9mm Luger)
- Barrel Length: 4.5 Inches
- Twist Rate: 1:10
- Muzzle Thread: 1/2″x36 TPI
- Material: 416 Stainless Steel with Flat Gray Finish
- Compatibility: Designed for AR-9/AR-15 pattern firearms using a blowback bolt carrier group.
FAQ
Will this barrel work with my standard AR-15 lower?
No, not directly. You will need either a dedicated 9mm AR lower designed for Glock or Colt magazines, or a standard AR-15 lower used with a 9mm magazine block adapter.
What bolt carrier group do I need for this AR9 barrel?
You need a dedicated 9mm blowback bolt carrier group. Standard 5.56/.223 bolts will not headspace correctly and are unsafe to use with this 9mm barrel.
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