Matrix Arms Gen 2 9mm LRBHO AR9 Lower Receiver *FFL Item*

Matrix Arms Elite Gen 2 AR9 Stripped Lower Receiver

The Matrix Arms Elite Gen 2 AR9 Stripped Lower Receiver is built for shooters who want the familiar ergonomics of the AR15 platform with the reliability and convenience of Glock-pattern magazines. Precision machined in the USA, this dedicated AR9 lower is compatible with Glock-style 9mm and .40 S&W magazines, making it an excellent foundation for a pistol caliber carbine (PCC) build.

The Elite Gen 2 lower is designed to work with standard mil-spec AR15 lower parts kits, mil-spec receiver extensions (buffer tubes), and most mil-spec AR15 or dedicated AR9 upper receivers, allowing you to build with readily available components instead of proprietary parts. An integrated Last Round Bolt Hold Open (LRBHO) system provides AR15-like operation by locking the bolt to the rear after the final round is fired when used with compatible components.

Whether you’re assembling a competition PCC, range rifle, truck gun, suppressor host, or home defense firearm, the Matrix Arms Elite Gen 2 lower delivers the versatility and compatibility today’s builders expect.

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Features

• Matrix Arms Elite Gen 2 design
• Dedicated AR9 stripped lower receiver
• Integrated Last Round Bolt Hold Open (LRBHO)
• Compatible with Glock-pattern 9mm magazines
• Compatible with Glock-pattern .40 S&W magazines
• Accepts standard mil-spec AR15 lower parts kits
• Compatible with mil-spec AR15 buffer tubes
• Fits most mil-spec AR15 upper receivers
• Compatible with dedicated AR9 upper receivers
• Skeletonized Elite styling
• Precision machined aluminum construction
• Type III hard coat anodized black finish
• Made in the USA

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Specifications

Manufacturer: Matrix Arms

Model: Elite Gen 2

Platform: AR9 / PCC

Magazine Compatibility:

• Glock-pattern 9mm
• Glock-pattern .40 S&W

Upper Receiver Compatibility:

• Most Mil-Spec AR15 Upper Receivers
• Dedicated AR9 Upper Receivers

Lower Parts Compatibility:

• Standard Mil-Spec AR15 Lower Parts Kit

Receiver Extension Compatibility:

• Mil-Spec AR15 Buffer Tube

Bolt Hold Open:

• Integrated Last Round Bolt Hold Open (LRBHO)

Construction:

• Precision Machined Aluminum

Finish:

• Type III Hard Coat Anodized Black

Country of Manufacture:

• USA

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Why Choose the Matrix Arms Lower?

The Matrix Arms Elite Gen 2 lower combines the flexibility of the AR15 platform with the affordability and availability of Glock-pattern magazines. By using common AR15 components, builders have access to countless options for triggers, grips, controls, and furniture while maintaining compatibility with dedicated AR9 operating systems.

The integrated Last Round Bolt Hold Open (LRBHO) feature enhances the shooting experience by automatically locking the bolt to the rear after the final round is fired, making reloads faster and providing immediate visual confirmation that the firearm is empty.

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Built Around Standard AR15 Components

One of the biggest advantages of the Matrix Arms Elite Gen 2 lower is its compatibility with many standard AR15 components.

Compatible parts include:

• Mil-spec AR15 lower parts kits
• Standard AR15 triggers
• AR15 pistol grips
• Mil-spec receiver extensions (buffer tubes)
• Most mil-spec AR15 upper receivers
• Dedicated AR9 upper receivers

Using widely available components makes your build easier to customize, upgrade, and maintain.

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Glock Magazine Compatibility

The Matrix Arms Elite Gen 2 lower accepts Glock-pattern magazines chambered in both 9mm and .40 S&W. Glock-pattern magazines have become the industry standard for many AR9 platforms thanks to their widespread availability, durability, and extensive aftermarket support.

Whether you prefer OEM Glock magazines or quality aftermarket options, you’ll have plenty of choices for capacities and configurations.

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Why Buy from Mid State Firearms?

At Mid State Firearms, we build AR-platform firearms every day and understand the importance of component compatibility. We carefully select products that provide dependable performance and pair well with the parts we offer.

Looking to complete your build? We also carry AR9 uppers, lower parts kits, buffer assemblies, triggers, and other components to help you build a reliable pistol caliber carbine.

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Frequently Asked Questions

What magazines does this lower accept?

The Matrix Arms Elite Gen 2 lower is compatible with Glock-pattern 9mm and .40 S&W magazines.

Does this lower use standard AR15 lower parts?

Yes. It accepts mil-spec AR15 lower parts kits, allowing you to use common triggers, safety selectors, grips, and controls.

Will this fit a standard AR15 upper receiver?

Yes. The lower is compatible with most mil-spec AR15 upper receivers as well as dedicated AR9 uppers. As with any AR9 build, proper reliability depends on using compatible bolts, barrels, and buffer systems.

What is Last Round Bolt Hold Open (LRBHO)?

The integrated LRBHO feature automatically locks the bolt to the rear after the final round is fired when using compatible components, providing AR15-style operation and quicker reloads.

Is this a complete lower?

No. This is a stripped lower receiver and requires a lower parts kit, buffer assembly, stock or brace (where applicable), and other components to complete the firearm.

THIS ITEM REQUIRES A FFL, IT MUST BE SHIPPED TO A FFL DEALER OF YOUR CHOOSING.

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Build Your AR9 with Confidence

The Matrix Arms Elite Gen 2 AR9 Lower Receiver offers an excellent balance of compatibility, reliability, and customization. By combining Glock magazine compatibility with standard AR15 components, it’s an ideal choice for builders who want an easy-to-source, easy-to-maintain PCC platform.

Whether you’re building a recreational range gun, a USPSA PCC, or a suppressed 9mm carbine, the Elite Gen 2 provides a solid foundation. Pair it with an AR9 upper, quality lower parts kit, and the appropriate buffer system from Mid State Firearms to complete a dependable, American-made build.