Maxim Defense Defense Md9 Cqb 9mm 5.5 Urban Md-Cqb

The Maxim Defense MD-9 CQB is a purpose-built 9mm AR-style rifle engineered for shooters who want modern platform ergonomics in a compact, maneuverable package. Built on Maxim's reputation for innovative AR design, the MD-9 combines a free-floating barrel with a custom handguard that mirrors a monolithic upper receiver platform—giving you precision accuracy and M-Slot compatibility for mounting accessories. At just 20 inches overall with a 5.5-inch barrel, this is a rifle designed for close-quarters work, home defense, or shooters who value a tight turning radius without sacrificing capability.

The MD-9 CQB ships with Maxim's proprietary brace, keeping your platform legal and functional straight out of the box. The 7075 aluminum and tool steel construction, finished in nitride and Type III hard anodize, stands up to duty use while keeping weight down at 6.1 pounds—light enough to move all day, stiff enough to shoot. Thread pitch is 1/2-28, so you can run suppressors and brakes from a deep aftermarket pool. The free-floating barrel minimizes harmonic vibration, a real asset when you're running this caliber and want consistent performance.

Magazine compatibility matters when you're building a 9mm rifle, and the MD-9 runs standard Glock mags—meaning ammunition and magazines are everywhere you hunt or train. That 31-round capacity gives you serious firepower in a compact form factor. Whether you're a competition shooter exploring AR-9 platforms, a home defender, or an overlander who wants a multi-role rifle, the MD-9 CQB delivers Maxim's engineering in a configuration built for real-world use.

Key Features

• Free-floating barrel for improved accuracy and consistency
• Custom handguard with M-Slot compatibility for easy accessory mounting
• Monolithic-like upper receiver platform for rigidity and modularity
• Compact 5.5-inch barrel and 20-inch overall length for tight maneuverability
• Integrated CQB brace included
• Runs standard Glock magazines (31-round capacity)
• Lightweight construction at 6.1 pounds
• Nitride and Type III hard anodize finish for durability
• 1/2-28 thread pitch for suppressor and muzzle device compatibility

Specifications

Frequently Asked Questions

What magazines does the Maxim Defense MD-9 use?

The MD-9 runs standard Glock magazines. A 31-round magazine is included with the rifle, and Glock mag compatibility means you have endless options in the market for spare ammunition and magazines.

Can I mount a suppressor on this rifle?

Yes. The MD-9 has a 1/2-28 thread pitch, which is the standard for most 9mm suppressors and muzzle devices on the market today.

What is the barrel length and what is this rifle designed for?

The MD-9 CQB has a 5.5-inch barrel and an overall length of 20 inches, making it compact and maneuverable for close-quarters use, home defense, and shooters who prioritize a tight platform.

Does the rifle come with the brace?

Yes, the MD-9 CQB ships with Maxim Defense's proprietary CQB brace included.