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When you’re looking for Maxim Defense ingenuity in a new standard AR-9, the MD-9 is your answer. The MD-9 was engineered to fit the growing demand for cutting-edge AR9-style rifles for today’s Military and commercial market.

Every MDX features our free-floating barrel with our custom handguard for increased comfort and versatility. These handguards provide a monolithic-like upper receiver platform and M-Slot compatibility.


  • Maxim Defense Hatebrake.
  • M-Rax and M-Slot compatible handguard.
  • ALG Combat trigger.
  • Radian charging handle and selector.
  • Maxim SCW brace, stock, or pistol system.
  • Ambidextrous magazine release.
  • Fully floated barrel.
  • Last round hold open.


  • Receives all Glock 9mm pattern magazines, G19 and longer.
  • MIL-SPEC+ coatings and materials.
  • Fully and easily serviceable.
  • Disassembles with standard tools.

Due to the ATF Ruling Factoring Criteria for Firearms With Attached “Stabilizing Braces” that published on 1/31/23

ALL Maxim Defense Pistol Braced firearms will now ship WITHOUT the Pistol Stabilizing Brace.

The ATF Q&A document states, “Permanently remove or alter the “stabilizing brace” so that it cannot be reattached and thereby removing it from regulation as a “firearm” under the NFA.

Contact our Customer Service department at 239-580-7800 or email to discuss your order and/or other options. All Federal, State, and local laws on ownership still apply.

Puerto Rico Customers: Consumers must go through your local PR dealer. Dealers must buy through Distribution. effective 10/03/2019

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